Showing posts with label Seo Tutorial 2014. Show all posts
Showing posts with label Seo Tutorial 2014. Show all posts

Monday, January 13, 2014

On Page SEO Part 2: An Introduction To Signals of Quality


In the previous tutorial we looked at some basic on page factors including the alt attribute. It was suggested that every img tag should also have an alt attribute even if the image referred to was entirely decorative. These changes might at first seem a bit pedantic, however it makes for better accessibility and standards compliant HTML.


Ensuring pages are accessible and standards compliant can cause a lot of work for webmasters trying to rectify things after a site has gone live, especially if every page contains multiple HTML errors. So is it worth all the bother? The simple fact is that accessible sites are generally more search engine friendly and can be viewed on a wider selection of devices and browsers.
Making sure that every piece of html code on every page validates and meets current accessibility standards are signals that a business cares about every single visitor to their website. Spammers using ‘throwaway domains’ are more likely to shy away from this type of work because of labor, time and expense.
Signals of quality are rarely about relevance, for example it’s easy to understand why allowing a page to go live as an ‘untitled document’ would harm relevancy, it’s not so obvious why including a telephone number would increase search engine rankings.
There is a distinct difference between quality and relevance and search engine must necessarily balance both aspects in order to deliver the best results. The task of Identifying quality is becoming increasingly important due to the amount of low-quality content that is being uploaded to the web every day.

Bayesian Filters

Bayesian filtering is utilized by most modern day mail clients as a means to weed out spam emails from legitimate emails. Search engines use it to categorize documents and Google uses it to deliver relevant Adsense ads. How do Bayesian filters Work? Initially the process starts with a list of sites that have been classified as high quality and another list that has been classified as low quality. The filter looks at both and analyzes the characteristics common to either type of site.
Once the filter has been seeded and the initial analysis completed they can be used to analyze every page on the web. The clever thing about Bayesian filters is that they continue to spot new characteristics and get smarter over time. Before we delve into any great detail on how Bayesian filters work, here is a couple of quotes from Matt Cuts regarding Signals of quality that clearly show Google is addressing the problems caused by low quality mass generated content.
“Within Google, we have seen a lot of feedback from people saying, Yeah, there’s not as much web spam, but there is this sort of low-quality, mass-generated content . . . where it’s a bunch of people being paid a very small amount of money. So we have started projects within the search quality group to sort of spot stuff that’s higher quality and rank it higher, you know, and that’s the flip side of having stuff that’s lower-quality not rank as high.”
“You definitely want to write algorithms that will find the signals of good sites. You know, the sorts of things like original content rather than just scraping someone, or rephrasing what someone else has said. And if you can find enough of those signals—and there are definitely a lot of them out there—then you can say, OK, find the people who break the story, or who produce the original content, or who produce the impact on the Web, and try to rank those a little higher. . . .”
There has been mention of Signals of Quality in Google patents and some specifics have been discussed by Google engineers so hopefully the days of article mills and article spinners are numbered.

How Bayesian Filtering Works

Although it is known that search engines use Bayesian Filtering the exact algorithm is of course proprietary and unlikely to be made public, however the actions of Bayesian filters are well understood. So lets start by looking at how Bayesian filtering works.
To begin a large sample or white list of known good documents (authoritative highly trusted pages) and a large sample of known bad documents (pages from splogs, scrapper sites etc) are analyzed and the characteristics of each page compared. When a large corpus of documents is compared programmatically patterns or ‘signals’ emerge that were hitherto invisible. These signals can then be used to provide a numeric value (or percentage likelihood) of whether the characteristics of other pages lean towards those from the original sample of good documents or those from the original sample of bad documents.
Some simple examples of this would be to compare the words in the good documents to those in the bad documents, if it is discovered that many low quality pages use the terms like ‘buy cheap Viagra’ or have a section on each page for ‘sponsored links´ then other pages that do the same might be of low quality also. Conversely if it is discovered that high quality pages often contain a link to a Privacy Policy or display a contact telephone number then other pages that do the same might also be high quality pages.
As the process continues more signals are uncovered. In this way the filter learns to recognize other traits and whether they are good or bad. There is likely to be many signals of quality measured, each one adding to or subtracting from an overall score of a pages quality.
This means is that SEO’s web designers and webmasters need to adopt a holistic approach that takes into account information architecture, relevancy, accessibility, usability, quality, hosting and user experience.

The Link Structure of The Web

Although links will be covered in future tutorials, it makes sense to discuss some of the implications of recent changes in the link structure of the web now. Once upon a time reciprocal links were all that were needed to achieve top search engine rankings. Because reciprocal links were easy to acquire and made it easy to promote sites of lesser quality so that they outranked quality sites search engines stepped in and devalued reciprocal links along with PageRank.
One way links were now the way to go, so a new market in selling one way links emerged. Search engines again viewed this as a way to game the system and paid links, if detected, were devalued so that they passed no value whatsoever. The nofollow attribute was implemented so that, amongst other reasons, links could be sold without penalty. The nofollow attribute has also been adopted for other reasons and is used on millions of blogs and some of the most popular social sites.
URL shortening is also popular and again is used by some of the most popular sites on the web. The upshot of all this is that although the web continues to grow the ability of many millions of pages to link out and cast a vote for other pages has been removed. Of course you still get the traffic which can be substantial if you make the front page of Digg. Because the link graph of the entire web is essentially in recession, search engines are again reevaluated the way they calculate rankings and quality has many discernable signals.

The Need To Discern Quality

According a study carried out by WebmasterWorld the top 15 doorway domains are a haven for spam. The study analyzed popular search terms and discovered that more than 50% of the results were spam. 77% of the results from blogspot.com were found to be spam. The following list shows the level of spam found on the top 15 doorway domains:
Dorway Domain
Spam%
sitegr.com
100%
blog.hix.com
100%
blogstudio.com
99%
torospace.com
95%
home.aol.com
95%
blogsharing.com
93%
hometown.aol.de
91
usaid.gov
85
hometown.aol.com
84
maxpages.com
81
oas.org
78
blogspot.com
77
xoomer.alice.it
77
netscape.com
74
freewebs.com
52
The study shows that on the keywords tested some of these blogs are used exclusively by spammers, while others had a very high percentage. The reason for this is that these sites provide free blog space which is a magnet for spammers who need to generate links to low quality splogs or scraper sites quickly.
The next list compares percentage of spam sites by top-level domain' (TLD):
TLD
Spam%
.info
68
.biz
53
.net
12
.org
11%
.com
4%


This research highlights the incredible amount of spam that exists on the web but it would be unfair to penalize every .info domain for example just because a high percentage of .info domains are used by spammers
Conversely it would be unwise to trust every .com even though in general they seem to be comparatively spam free. To discern quality many signals have to be considered covering every aspect of a website.
The next tutorial in this series will be looking at on page signals of quality nad why quality score is the new PageRank

On Page SEO Tutorial Part 1: Basic On Page Ranking Factors

On-page Optimisation

It is now time to start optimising your web pages. By this stage you should have a good idea about the keywords you wish your site to rank for and some knowledge of who your main competitors are. This unit will show you how to use this information when constructing web pages.

By the end of this unit, you should be able to:
  • optimize the page title of HTML pages
  • optimize the Meta tags of HTML pages
  • optimize your page headings
  • write keyword focused page content and copy
This unit assumes that you have read the last two units of the course, and that you know how to construct a basic HTML web page.
10.1 On-page factors
As we explained in earlier units of the course, on-page factors relate to the code and content that actually appears on your web pages. In SEO, on-page factors are usually distinguished from off-page factors such as external links. Unlike external links, on-page factors are largely under your control as a webmaster, web designer or site owner. This means that they are fairly easy to manipulate in order to improve your search engine visibility.
In this section we will be looking at how to optimise such basic things as:
  • page titles
  • Meta tags
  • headings
  • page copy
  • img alt attribute
In simple terms, the key to optimising your web pages is to focus all of these areas around the main keywords for your product or services - assuming that you have followed the instructions set out in previous parts of this course and have already researched the keyphrases that your website should be targeting.
Note: focusing your pages around the wrong keywords can potentially have a detrimental effect on search engine visibility, so make sure that you have researched your market and competitors prior to attempting to optimise your site.
Before we cover the above topics, let’s have a basic look at the areas of a HTML web page that concern us:
  • Title tags
  • Meta tags dealing with ‘keywords’ and ‘description’
  • Internal links (including the anchor text used in internal links)
  • Headings (particularly the first heading <h1></h1>)
  • Page copy
10.1.1 Page Title
The Page title is the title that appears at the top of your browser when you visit a web page. It is the first thing that a search engine sees and is therefore a particularly important part of the page from an SEO point of view.

It is one of the strange facts of Internet life that people often forget to include a title in their web pages. No doubt you have come across one of the countless pages on the Internet that simply read ‘Untitled Document’ when you view them in your browser. By failing to give your web pages a title you miss a golden opportunity to communicate what they are about to search engines and Internet users.
The page title appears in title tags (<title></title>) in the header section of your HTML web page as follows:
<head>
<title>Put your page title here</title>
</head>
It is particularly important that the page title contains the main keywords for the product or service that you offer on that page.
For example, the title of this page looks looks like this:
<title>On Page SEO Part 1, SEO Training Basics</title>
This title will appear in search engine results as an active link to our homepage:
Besides letting the user know what the page is about – which is an important function of the page title and should not be neglected – the title tag also signals to the search engine that our homepage is relevant for the following keywords:
  • On
  • Page
  • SEO
  • Part
  • 1
  • Training
  • Basics
Note how these words can be combined in numerous ways to make more complex keyphrases, e.g.:
  • seo training
  • on page SEO
  • on page SEO Training
  • basic SEO Training
This is a good principle to follow as it will help your page appear relevant for a variety of search queries.
To optimise your page title, take the following steps:
  • Follow the instructions for researching keywords outlined in the ‘Keywords’ section of the course.
  • Make a list of keywords for the page that you are optimising.
  • Write a title for the page that contains all your keywords.
  • Insert this title between the title tags of your HTML page.
Note: It is generally a good idea to limit the number of keywords/keyphrases you wish to make a page rank for to about a handful (ideally 3 or 4 closely related terms). Keep pages highly focused and use the most relevant and most searched terms for the product first. If you are targeting more than 4 keywords/keyphrases consider making another page that to target these additional terms so that each page is focused and highly relevant.
TASK 1: BEGINNING TO OPTIMISE YOUR HOMEPAGE
We will now begin the practical optimization of web pages by looking at your homepage.
If you already have a homepage, it would be a good idea to make a copy of your site and save it locally somewhere on your hard drive before you make any changes. Do not upload any changes made to your site to your hosting server at this stage, as you will be making further alterations to your homepage in later tasks.
If you do not have a homepage at this stage, construct a basic web page for your product using a HTML editor like Dreamweaver or a basic text editor like Windows Notepad. 
If you are using Notepad to construct your page, make sure that you save the document with its default extension (.txt) for now as we will be adding to it in later tasks. In order to view your finished page in as a web page, you will have to change its extension to .htm or .html. To save time, you can cut and paste the following basic template into notepad then save it with the name ‘index’:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>
<body>
</body>
</html>
TASK 1A: OPTIMISING TITLE TAGS
Now optimise the page title on your homepage by taking the following steps:
  1. Make a list of the commonly searched keyphrases for the products or services that your homepage offers.
  2. Insert your title between the title tags of your HTML page.
  3. <title>put your page title here</title>
Save your work locally for future editing. Do not upload it to your server.

Congratulations, you have just made your first practical attempt at optimising your website!
10.1.2 Meta Tags - ‘description’
Meta tags offer information that does not actually appear on the web page when viewed in a browser. The prefix ‘Meta’ comes from the Greek for ‘above’ or ‘beyond’, and in this context refers to information that is ‘beyond’ our view and that we do not normally need to see. These tags include the keywords and description tags and even though these tags have been devalued somewhat there is still good reason to use them.
Why include a meta description tag
Although the meta description generally has no direct impact on search engines primary results, you might want your web pages to meet with current accessibility standards, if so, then it should be included. I say generally because sites that are accessible will achieve higher rankings through Google Accessible Search than those that are not. Accessibility and the way it impacts search results will be discussed in future tutorials.
When you omit a description tag search engines will create one for you. This is done by selecting snippets of text from the page that are relevant to the users search. You have no control over which snippets will be used which can result in descriptions made from multiple snippets that can appear incongruent and confusing.
The meta description appears in the head of your HTML page just after the title tag:
<head>
<title>YOUR TITLE HERE</title>
<meta name="description" content="YOUR PAGE DESCRIPTION HERE">
</head>
Although Meta tags contain information that people don’t normally see, the description Meta tag offers information that is both visible to search engines and visible on some search engine results. Google, for example, displays the actual text that appears in your Meta page description just below the link to your page. Bear this in mind when you write your page description, as search engine users use it to learn to what your web page is about.
With this in mind, the following principles should guide you when optimising the Meta description tag on your web pages:
  • the Meta description tag can, but does not need to, incorporate your main keywords however it should reinforce what you have already said in your title.
  • whether you use your main keywords or not, the description tag should clearly describe what the page is about.
  • the page title and description should work together as a benefit driven call to action designed to engage searchers and entice them to click through to your site.
TASK 2A: OPTIMISING THE DESCRIPTION META TAG
Now optimise the description Meta tag on your homepage. Open the local copy of the homepage you saved after completing Task 1, then take the following steps:
  1. Write a page description that will describe the page content and compliments the title.
  2. Insert your description into the correct HTML tag.
Save your work locally for future editing. Do not upload it to your server.
10.1.3 Meta ‘Keywords’
Many crawler based search engines, including Google, now ignore the meta keywords tag completely. But again to meet accessibility standards one should be included.
The reason that many search engines ignore the tag is because too many sites ‘spammed’ the tag in the early days of search engines. These sites attempted to rank for numerous phrases (sometimes phrases that they were not even relevant for) by cramming every keyword they could think of into their Meta tags. Even today, you will still encounter sites that have an incredibly long list of keywords in their Meta keywords tag.
The first rule to remember when optimising your keywords tag, therefore, is don’t ‘spam’ it. Even those few search engines that still index the tag will only read a limited amount of characters. Try and limit the number of characters (not words) to about 70 or 80, or even fewer if possible.
Despite the fact that a search engine giant like Google ignores the keywords tag, it is still a good idea to use the tag in order to improve your chances of being found in those search engines that still read it. In an HTML page, the keywords tag appears in the header section below the title tags as follows:
<head>
<title>YOUR TITLE HERE</title>
<meta name="description" content="YOUR PAGE DESCRIPTION HERE">
<meta name="keywords" content="YOUR KEYWORDS HERE">
</head>
  • the keywords tag should employ the main keyphrases for your product or services and should be synchronous with your title tags and page description.
  • keywords should be limited to words that appear on the page
  • each keyword or keyphrase should be separated with a coma
  • you do not have to use capitals in your keywords as search engines don’t treat them as case sensitive
TASK 2B: OPTIMISING THE KEYWORDS META TAG
Now follow the above steps and optimise the keywords Meta tag on your homepage in the local copy of the homepage you saved after completing Task 2A. Don’t forget to save your work
10.1.4 Internal Links
Internal links are, of course, the links on your site that point to other pages on your site. These are the means by which people navigate around your website. We will cover links more fully in the next unit. At this stage, the important thing to remember when optimizing internal links is to use the keyphrases for the page that you link to in the anchor text of the link. In this way, the link passes relevancy on to the page that it links to.
For example, if your homepage sells gift products and includes a link to another page that aims to rank for the term ‘christening gifts’, your anchor text might appear as follows:
<a href=“http://www.giftsforsale.co.uk/christening.html”>Christening Gifts</a>
10.1.5 Headings
In this context, your page headings are the words that appear between HTML heading tags. These tags are usually run in numerical order starting with <h1></h1> and moving up through <h2></h2>, <h3></h3>, and so on up to <h6></h6>.
The heading to pay particular attention to is your first heading. This is one of the first things that both search engines and Internet users see.
Your first page heading should be placed in the body section of your HTML page. Place it between <h1></h1> tags just before your page copy, i.e.:
<head>
<title>PAGE TITLE</title>
<meta name=“description” content=“PAGE DESCRIPTION”>
<meta name=“keywords” content=“PAGE KEYWORDS”>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<h1>YOUR HEADING HERE</h1>
<p>PAGE COPY HERE</p>
</body>
Here are the main points to follow when writing your page heading:
  • place your first heading in <h1></h1> tags before your page copy
  • make sure that this heading employs the keywords that you want your page to rank for and that it reinforces the keywords in the header section of your HTML page
The same principles can be applied to other page headings of course.
Note: Remember that, unlike the information that appears in your Meta tags, visitors can read your first heading. If you have too many keywords, or if the use of all your keyphrases in this heading makes it appear too long or clumsy, then just write a heading that contains your main keyphrase. You can perhaps put your other keyphrases in later headings.
TASK 3: OPTIMISING HEADINGS
Now open your saved homepage and add a first page heading which follows the principles outlined above. Save your work then move on to optimising the page copy
10.1.6 Page copy
When we refer to copy, we are referring to the actual words and information that appear on screen when a visitor reads your page.
In some respects, writing copy is the most difficult part of optimising your web pages as it involves knowing the principles of marketing, ‘proper’ English, and SEO. We can’t possibly cover the basics of effective web copywriting in this short section, so the next unit will take a more in-depth look at the area. Nevertheless, since page copy is an on-page factor, here are some basic tips to help you write optimised web copy:
  • keep it informative.
    People use the Internet to gain information as well as to purchase products. Give them what they want.
  • keep it short and to the point.
    People don’t like to read a lot of scrolling text on screen.
  • make it ‘scanable’.
    People tend to ‘scan’ web pages rather than read their entire content. Break your copy into sections and put your most important points in the first sentence of each paragraph.
  • keep it plain.
    Grandiloquence, digression and circumlocution are superfluities that epitomise impenetrable online prose!
  • call to action.
    If you are selling a product or service, remember to include a ‘call to action’ somewhere on your page (e.g. ‘buy now’, ‘call today’, ‘email us for a free consultation’, etc.).
  • keep it professional.
    Always proofread your copy for spelling mistakes and grammatical errors.
One important thing to note, however, is that SEO copywriting differs slightly from normal Internet copywriting. Whereas normal copywriting simply markets, or informs someone about, a product or service, the aim of SEO copywriting is to make your page appear more relevant for your chosen keywords by employing those keywords in your page copy in such a way that it improves the pages relevance and is wholly self descriptive.
As we noted earlier in this course, keyword density is a measurement by percentage of how many times keywords appear on a page in relation to other text. However search engines don’t count keywords in this way. However it is important that you get your keywords into the areas we have already discussed plus featured prominently in the first paragraph, in bold text and in lists.
The key to writing search engine friendly copy is to ensure that you get your keywords into these areas while still writing in plain, easy to understand English. That way, you satisfy both the demands of the search engine and the needs of the individual Internet user. The main purpose of SEO copywriting is to engage the reader from the first headline to the closing call to action. Along the way explain ‘What’s In It For Me’ i.e. clearly explain what benefits potential customers will enjoy by using or switching to your products or services.
Here are the main principles you should follow when writing search engine friendly copy.
  • you should have at least some text in your web page, as this will give the search engine something to latch on to when attempting to determine the relevance of your page for particular terms.
  • your copy should employ the same keywords used in the page title, Meta information, and page headings.
  • although your text should include the keywords you are targeting, write naturally and do not spam keywords by repeating the same phrases over and over again.
  • make sure that your copy is still written in plain English and still satisfies the aim of informing the Internet user about your products and services.
Note: placement of text can be important. Aim to make your main page copy one of the first things a search engine sees by placing it just under your first heading. If you have a table or css div to the left of your main page copy, make sure it is not full of text that takes precedence over your main page copy.
Page copy usually appears in paragraph tags <p></p> on your HTML page, as in the following example:
<body>
<h1>YOUR FIRST HEADING</h1>
<p>FIRST PARAGRAPH OF PAGE COPY HERE: Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. </p>
<p>SECOND PARAGRAPH, and so forth</p>
</body>
TASK 4: SEO COPYWRITING
Your task is to write a short, two-paragraph description of your main products and services (no more than 300 words for the purpose of this task, although your homepage can include a lot more text) for your homepage in such a way that it uses the main keywords for that page. Keep your prose simple and do not ‘spam’. Once you have finished, place it in the relevant section of your HTML page and save your work.
10.1.7 img alt attribute
The contents of an image alt attribute, often mistakenly called an alt tag, are no longer considered when calculating the relevancy of a page by any of the major engines. However, improper use of the alt attribute can adversely affect the rankings in the SERPs. As search engines evolve they continue to catch up with SEO tactics that are intended to improve rankings by gaming their algorithms while damaging the visitor experience.
The purpose of the alt attribute is to provide alternative text descriptions of your images. An example of an alt attribute used for a company logo might look like this:
<img src="images/logo.jpg" width="100" height="78" alt="XYZ SEO Company " />
From an accessibility point of view every <img> tag should have an alt attribute that describes the image, if that provides an opportunity to use keywords appropriate to the page so much the better. Descriptive alt attributes, headings and the text close to the image can improve rankings within image search. If you have a large catalogue of products this can be an important and sizable source of traffic. Rather than use the alt attribute as an excuse for keyword stuffing use them to describe the content of image.
Note. The last thing that visually impaired visitors using screen readers want to listen to a long list of keywords stuffed into every image. Also stuffing every keyword you can think of into 1 pixel by 1 pixel invisible image is, and always has been, spam.
Images that are purely decorative require no alt text but still require an alt attribute. That is to say, the required alt attribute should have a null value: alt="". Don't define alt=" ", the alt attribute should be an empty string, not a space. If your layout uses invisible images to help with positioning, for example:
<img src="spacer.gif" width="1" height="10" />
Change it to:
<img src="spacer.gif" width="1" height="10 " alt="" / >
Images that are purely decorative should be treated the same way. For example:
<img src=" top-right .gif" width="40" height="20" />
Change it to:
<img src=" top-right .gif" width="40" height="20" alt="" / >
These changes might seem a bit pedantic, especially if you don’t show product images. However there are accessibility issues to be concerned about and one should also strive to make HTML code standards compliant. This can cause a lot of work for webmasters trying to rectify things after a site has gone live especially if every page contains multiple html errors. How Accessibility impacts SEO will be discussed in future tutorials, all that needs to be said at this juncture is that accessible sites are generally more search engine friendly and can be viewed on a wider selection of devices and browsers.
Congratulations, you have now carried out a basic optimization of your first web page. Repeat the above steps to optimize your other web pages.
Remember that search engines rank individual pages and not websites as a whole. This means that you should not use exactly the same keywords as your homepage on other web pages. You should use your other pages to target different keywords related to your products or services.
You can now upload your saved page to your hosting server if you like.
SUMMARY:
  • on-page factors refer to the content on your individual web pages
  • the easiest way to optimise your web page is to employ the keywords and keyphrases you wish the page to rank for in key areas of that page
  • your page title, Meta tags, page heading and page copy should all mention your keyphrase without resorting to being overly repetitious.
10.2 Conclusion
Optimizing on-page factors is an essential step in the SEO process and one that you can easily perform on your own web pages. By following the principles outlined in this unit you can now start optimizing every page on your site.
In the next unit, we will look at links and the external factors that influence your search engine ranking.
REFLECT:
What is your understanding off the SEO implications of the following?
  • On-page factors
  • Title tags
  • Meta tags
  • SEO copywriting
Course Index

A Guide to Google PageRank

A Guide To Google PageRank

If you’ve spent time investigating Search Engine Optimisation then you will have noticed that the topic of Google PageRank pops up with the predictable regularity of a well engineered Swiss watch. So, in line with tradition this article provides a brief overview PageRank, what it is, what it isn’t and some useful guidelines to help ensure PageRank is maximised and flows throughout your website without hindrance.
What Is PageRank?
PageRank relies on the uniquely democratic nature of the web by using its vast link structure as an indicator of an individual page’s value. In essence, Google interprets a link from page A to page B as a vote, by page A, for page B. But, Google looks at more than the sheer volume of votes, or links a page receives; it also analyzes the page that casts the vote. Votes cast by pages that are themselves “important” weigh more heavily and help to make other pages “important.” SourceGoogle.
PageRank or PR is a measure of importance Google applies to every web page maintained in its index. The higher the PageRank the more important a page is. PageRank is calculated in the absence of a search query and, contrary to what you might read elsewhere, has very little influence on search engine rankings.
Importance, as far as PageRank is concerned, should not be confused with relevance otherwise high PageRank pages like Google’s index page would top search engine results pages for every search regardless of the original query. Nor is PageRank influenced by on page elements and tags such as Page Titles, Heading Tags, length of copy, semantics or anchor text.
PageRank values are completely governed by inbound and outbound links from and to pages within the same domain and those of external domains.
Why Is PageRank Important
PageRank on its own, like many other metrics that influence rankings, offers only minor benefits. To gain top search engine rankings many different metrics have to be considered along with PageRank. Because PageRank has nothing to do with relevancy it sort of stands out on its own. The following calculation illustrates how PageRank influences rankings:
Ranking Score = Relevancy Score * PageRank Score
Even at first glance it is pretty easy to see how low relevancy high PR pages could outrank highly relevant low PR pages. This would indeed lower the quality of Google’s results so to combat this the calculation probably looks more like this.
Ranking Score = Relevancy Score * (PageRank Score/100)
Even with a dampening factor applied when two pages with identical relevancy are scored the one with the highest PageRank will come out on top and outrank the other in Google’s SERPs.
PageRank forms a major part of link analysis. Link analysis is used by search engines to detect link spam, hub sites, authority sites and neighborhoods, it is therefore important to ensure its effective distribution through your website. Moreover, by sculpting the way PR flows through a website can encourage Google to spider your most important or regularly changing pages more frequently.
How Do You Check PageRank?
The simplest way to compare the relative PageRank of your pages with related pages or those of competitors is to install the Google Toolbar (toolbar.google.com). Once installed the toolbar will show PageRank from the Google data center supplying your results, however the server Google chooses to deliver your search results can change depending on load and geographic location. If you wish to inspect PageRank over multiple data centers there are a few tools like http://www.seocentro.com/tools/search-engines/pagerank-dc.html rhat will allow you to do this.
There is much speculation that the option to view PageRank in the toolbar will be removed in the near future. Within Google´s Webmasters tools the PageRank distribution feature found on the crawl stats section under "Diagnostics," has already gone. Google had this to say about its removal:
We've been telling people for a long time that they shouldn't focus on PageRank so much; many site owners seem to think it's the most important metric for them to track, which is simply not true. We removed it because we felt it was silly to tell people not to think about it, but then to show them the data, implying that they should look at it. :-)
How Is PageRank Calculated
The PageRank of any webpage is based on a calculation that takes into account the number of pages that link to it and the PageRank of those pages. PageRank is calculated on a page by page basis therefore each page on the web has its own value which, when viewed in the Google Toolbar, can be anything from 0 to 10.
Although the Google Toolbar PageRank is only be updated every 3 months or so, actual PageRank is dynamic and is recalculated every time Google discovers a new link or one is dropped. Google constantly spiders the web by following the links that connect web pages and by doing so not only maps out the web on a page by page basis but also how those pages are connected. In a very basic sense the most important pages (those with the highest amount of links pointing to them) are awarded the highest PageRank.
There is however more to PageRank than simply counting the number of links that point to a page, although this aspect does reflect the democratic nature of the system where a link from Page A to Page B counts as a vote for Page B. One also has to take into account the PageRank of the page casting the vote and the amount of links on that page. So a PR2 page with 5 links is going to channel more page rank through each link than a PR3 page with 10 links on it. In short the amount of PR passed through each link is based on the PageRank of the page divided by the number of links on the page.
If you were to add up all the PageRank available to a website prior to any inbound links being placed it would be equal to the number of pages in the site * 1. This amount is decreased with every outbound link to another website, remember PageRank is channelled through links so every outbound link draws PageRank away from a site. Conversely, this number can be increased by gaining inbound links from other sites.
Finally there is a damping factor; this part of the PageRank algorithm represents the likelihood that an imaginary surfer engaged in randomly clicking links will eventually stop. The damping factor adjusts derived PageRank values downward.
The PageRank calculation is rather complex, so I do not intent to go into the mathematics that lie behind the system in any depth, nor do I think it required knowledge as far as understanding the main points of this document is concerned. I will however, include links at the end of this document for all the sadists with an interest in such things.
Dispelling a Long Standing PageRank Myth
There are many descriptions of PageRank online that suggest PR values can be increased through the use of Meta tags and optimising specific HTML tags and elements. These steps may well improve rankings by improving relevancy but have nothing to do with PageRank.
The amount of PageRank available within the Google index is equal number of pages in the index * 1, that is billions of PageRank points to be distributed amongst billions of pages. The number is dynamic in the sense that it constantly changes as new pages are added to the index and others dropped. PageRank is not contextual in any means and cannot be increased by adding a few more keywords to your pages. Nor is it influenced by anchor text, in fact a graphic link without any anchor text will pass the same PR value as a link from the same page with well targeted anchor text. The later would be the better link however because it passes both PageRank and keyword relevancy to the target page.
URL Conventions
Although the URLs http://www.domain.com/, www.domain.com/, www.domain.com/index.html and index.html refer to the same page there is a danger that search engines may see them as four different pages. This could result in PageRank being shared on these URLs and appearing much lower than it actually is.
This can come about by using relative paths within the links that connect your pages. For example if someone decides to link to your home page from another website the URL would look something like:
http://www.domain.com/
However, a link from the same domain using a relative path would look something like this:
Index.html
This could result in the PageRank from external links being channelled to the absolute URL and PageRank from internal links being channeled to the relative URL. The end result is that PageRank is lowered on both URLs.
To get round this problem and help ensure that PageRank is correctly channeled throughout your entire site use absolute URLs on every link.
Canonicalization
Search engines consider http://www.hubpages.com and http://www.hubpages.com different websites. If you are logged in to HubPages log out now and try visiting the homepage using both www and the non www version of the URL.
http://www.hubpages.com
http://hubpages.com
Both URLs should take you to the site but pay close attention to what happens to the URL when you use the www version. It automatically drops the www and takes you to http://hubpages.com.
Now try it on your own website, it doesn’t really matter if you end up on the www version or the non www version, however if your site can be accessed by both you have a problem. If your website has inbound links using a mix of www and non www URLs you are effectively splitting the benefits of PageRank and the relevancy of any anchor text.
Using a 301 redirect, which is essentially a “permanent” redirect, you can elect one URL and effectively consolidate all of your link popularity to either the www or non www version of your site. This consolidation will insure that every link counts towards the same site and increase your website’s chances of obtaining and maintaining top rankings.
Brocken Links
Search engine robots crawl the web by following links. PageRank flows through links. Contextual relevancy is defined by analyzing the anchor text associated to links. Essentially, Links map out the structure of the entire web, identify neighborhoods and communities, define hubs and authorities, and infer the popularity and relevancy of each and every page on the web.
Search engines want to send users to current well maintained information, a site that contains lots of broken Links is an indication that a site is no longer maintained and can result in lower search engine rankings. Brocken links also starve all your pages of PageRank by channeling part of it towards pages that don’t exist.
There are lots of reasons why broken links come into existence, moving pages, renaming pages and deleting outdated pages. When renaming or moving a page remember to update all the links that point to it. Also put a 301 redirect in place so that new URL picks up the benefit of any inbound links pointing to the old URL from external sites.
PageRank Devalued
PageRank does effect rankings but not to the same extent that it once did. At one time simply exchanging links with similarly themed sites would quickly build PR and rankings would improve considerably. Google took a stand against this SEO technique in two ways.
Firstly the reciprocal links themselves were devalued to such an extent that they are now virtually worthless. Reciprocal linking was for some time the single most effective way to improve search engine rankings; unfortunately Google viewed this practice as a means to game the PageRank algorithm. Webmasters would simply email each other offering reciprocal link exchanges for the sole purpose of improving rankings rather than exercising editorial control by linking to pages that would enrich their visitors experience.
Secondly, as a further consequence PageRank itself was devalued and no longer figures as an important factor in ranking web pages. PageRank was and still is a great way to identify quality pages however considering PR as a valuable asset when analyzing your backlinks or sourcing new links is of little consequence where rankings are concerned.
Perception
The fact is, a single PR7 link from a completely unrelated site could promote a page to PR5 or even PR6 although It is doubtful whether such a link would have any significant effect on rankings. There is however, a perception amongst web users that high PR is indicative of quality. So, although such a link might not improve rankings per say it can ease trust issues and make conversions easier.
FakeRank
It is possible to fool a browser into showing falsified PageRank; this is a known practice amongst unscrupulous link sellers who base their prices for the most part on Google’s Toolbar PageRank. One method of doing this is to wait for Googlebot to visit and sneakily redirect it to a high PR page. The end result is that the link seller’s page adopts the PR of the page it was redirected to and he can sell a completely worthless link for a few hundred bucks or more. A simple way to detect this is to look at Google’s cached version of the page. If it’s not the same website something is afoot and you should be very wary.
N.B. Not all link sellers are unscrupulous.

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