August 1, 2010

Google PageRank- Internet's official ranking system.

Internet's official Ranking System- A preview.

As per Google - PageRank Technology: PageRank reflects our view of the importance of web pages by considering more than 500 million variables and 2 billion terms. Pages that we believe are important pages receive a higher PageRank and are more likely to appear at the top of the search results.

PageRank also considers the importance of each page that casts a vote, as votes from some pages are considered to have greater value, thus giving the linked page greater value. We have always taken a pragmatic approach to help improve search quality and create useful products, and our technology uses the collective intelligence of the web to determine a page's importance.

What is Google PageRank? - Daniel
PageRank is a link analysis algorithm used by the Google Internet search engine that assigns a numerical weighting to each element of a hyperlinked set of documents, such as the World Wide Web, with the purpose of "measuring" its relative importance within the set.

PageRank was developed at Stanford University by Larry Page (hence the name Page-Rank) and later Sergey Brin as part of a research project about a new kind of search engine. The project started in 1995 and led to a functional prototype, named Google, in 1998. Shortly after, Page and Brin founded Google Inc., the company behind the Google search engine. While just one of many factors which determine the ranking of Google search results, PageRank continues to provide the basis for all of Google's web search tools

PageRank is based on citation analysis that was developed in the 1950s by Eugene Garfield at the University of Pennsylvania, and Google's founders cite Garfield's work in their original paper. By following links from one page to another, virtual communities of webpages are found. Web link analysis was first developed by Jon Kleinberg and his team while working on the CLEVER project at IBM's Almaden Research Center.

PageRank is a link analysis algorithm used by the Google Internet search engine that assigns a numerical weighting to each element of a hyperlinked set of documents, such as the World Wide Web, with the purpose of "measuring" its relative importance within the set. The algorithm may be applied to any collection of entities with reciprocal quotations and references. The numerical weight that it assigns to any given element E is also called the PageRank of E and denoted by PR(E).

The name "PageRank" is a trademark of Google, and the PageRank process has been patented (U.S. Patent 6,285,999 ). However, the patent is assigned to Stanford University and not to Google. Google has exclusive license rights on the patent from Stanford University. The university received 1.8 million shares in Google in exchange for use of the patent; the shares were sold in 2005 for $336 million.

Google describes 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".

In other words, a PageRank results from a "ballot" among all the other pages on the World Wide Web about how important a page is. A hyperlink to a page counts as a vote of support. The PageRank of a page is defined recursively and depends on the number and PageRank metric of all pages that link to it ("incoming links"). A page that is linked to by many pages with high PageRank receives a high rank itself. If there are no links to a web page there is no support for that page.

Google assigns a numeric weighting from 0-10 for each webpage on the Internet; this PageRank denotes a site’s importance in the eyes of Google. The PageRank is derived from a theoretical probability value on a logarithmic scale like the Richter Scale. The PageRank of a particular page is roughly based upon the quantity of inbound links as well as the PageRank of the pages providing the links. It is known that other factors, e.g. relevance of search words on the page and actual visits to the page reported by the Google toolbar also influence the PageRank. In order to prevent manipulation, spoofing and Spamdexing, Google provides no specific details about how other factors influence PageRank.

Numerous academic papers concerning PageRank have been published since Page and Brin's original paper.In practice, the PageRank concept has proven to be vulnerable to manipulation, and extensive research has been devoted to identifying falsely inflated PageRank and ways to ignore links from documents with falsely inflated PageRank.

Other link-based ranking algorithms for Web pages include the HITS algorithm invented by Jon Kleinberg (used by Teoma and now, the IBM CLEVER project, and the TrustRank algorithm.

Key points
So how does Google determine search results standings? Many people have taken a stab at figuring out the exact formula, but Google keeps the official algorithm a secret. What we do know is this:

  • PageRank assigns a rank or score to every search result. The higher the page's score, the further up the search results list it will appear.

  • Scores are partially determined by the number of other Web pages that link to the target page. Each link is counted as a vote for the target. The logic behind this is that pages with high quality content will be linked to more often than mediocre pages.

  • Not all votes are equal. Votes from a high-ranking Web page count more than votes from low-ranking sites. You can't really boost one Web page's rank by making a bunch of empty Web sites linking back to the target page.

  • The more links a Web page sends out, the more diluted its voting power becomes. In other words, if a high-ranking page links to hundreds of other pages, each individual vote won't count as much as it would if the page only linked to a few sites.

  • Other factors that might affect scoring include the how long the site has been around, the strength of the domain name, how and where the keywords appear on the site and the age of the links going to and from the site. Google tends to place more value on sites that have been around for a while.

  • Some people claim that Google uses a group of human testers to evaluate search returns, manually sorting through results to hand pick the best links. Google denies this and says that while it does employ a network of people to test updated search formulas, it doesn't rely on human beings to sort and rank search results

Getting a High Google PageRank- Gregory Movsesyan
For improving the PageRank of a website it is important to understand the process in which the ranking is done.

The success of any website depends on the rank that is assigned to it by popular search engines--the greater the rank the higher is the possibility of getting noticed on the Internet.

The success of any website depends on the rank that is assigned to it by popular search engines--the greater the rank the higher is the possibility of getting noticed on the Internet. Websurfers are usually attracted to the web pages according to their ranking in the search engine listings. The ones in the top ten positions are visited the most. For improving the PageRank of a website it is important to understand the process in which the ranking is done.

The PageRank (PR) given to a webpage indicates its importance. The webpage that ranks first is, obviously, a lot more important than the webpage that ranks eighth or ninth in the search engine listings. Google is considered to be the most important search engine by the web browsers. For assigning PRs Google first looks for pages that are linked up with other sites the most. When one webpage links up with another webpage, Google interprets that the first webpage is casting a vote for the second webpage. The importance of a webpage is determined by the number of votes it gets--the greater the number of votes, the more important it is perceived to be. Another factor that determines the importance that a webpage gains depends on the significance of the voter itself. If a webpage gets its votes from web pages that are very important, it is considered to have a greater importance than the ones that are voted by a large number of web pages that are not all that important.

The PR feature is one of the vital factors that determines the rank that Google assigns to the webpages in its search engine results, though it is not the only criterion for deciding its search engine rankings. The search engine rankings are influenced by factors other than the PR feature too.

While calculating the PR Google does not take all the linkings into account. If a webpage is getting links from known link farms, the link is not considered for deciding upon the PR. Link farm can be defined as a group of websites that hyperlink to every other site existing in the group. In fact, a webpage can get into trouble with Google for linking up with certain links. Google does not penalize webpages for the links that automatically link up with them, but they definitely penalize a webpage for forming some unfavorable links, because forming links is in the hands of the webmasters, though getting automatically linked up is not controlled by them. Hence a webpage needs to be very careful about the association that it makes. Usually sites that have a PR zero are the ones that are under a penalty and they should not be linked to.

For calculating the PR, the number of its inbound links is first considered. Google has a generalized formula which it uses to calculate the PR. Whenever a webpage links to another webpage, it gives it a certain PR value by voting for it. This PR value should be slightly lesser than its own PR value. This value is equally distributed among all the web pages that it links to. For example, it is always better to get a link from a page that has a PR value of 5 and has six other links than from one which has a PR value of 12 and links up with 20 other web pages. This signifies that getting links from web pages that have numerous other links is not really helpful. It is better to link with web pages that have a high PR and link up with a lesser number of other websites.

It is also seen that the difference between the PR values of web pages is not equal, i.e., the difference between PR1 and PR2 and the difference between PR2 and PR3 is not same. It is believed that the difference is set on a logarithmic scale and it takes a greater amount of PR value to move from the one rank to the next higher ranks. In such a case it is seen that linking with a webpage that has more PR value is more profitable than linking with a webpage with lesser PR value, which is a contrary result to what has been deduced from the previous conclusion. However, in any case, it is seen that linking with other web pages increases the PR value and it is always better to avoid linking with link farms.

It should also be borne in mind that by voting for another webpage, the PR of a webpage does not decrease. But it is seen that the PR is lost in an indirect way by linking to other sites. The quality of linking done enhances the PR value of a page. Good linking gives a high rank, whereas a poor ranking gives a low rank. PRs are equally distributed between the different pages that a particular webpage links to. But, nowadays, certain techniques are used for increasing the PR values on some sites by using channeling methodologies.
Basics of Google PageRank (PR) - Vibhu Bansal
The ranking system developed by Google for websites is known as the page rank. With the lowest rank of zero and the highest of 10. This system determines your placement in Google organic search.

A person is able to search accurately for information from a number of websites during his search because of Google Page Rank algorithm. This is also commonly known as Page Rank or PR by webmasters and SEO specialists.

A Page Rank is a ranking system for websites that uses 0 as the lowest and 10 as the highest placement. A number of factors are taken into account when it comes to this ranking system. Among these are the length of time a website has been active, the sites that have backlinks to it, and its content. The presence of two-way links or one-way links and sometimes even three-way links is crucial in determining a website’s ranking. This is because these will show the popularity of a site. A website’s page rank is generally updated every quarter of the year. This can either go up or down. There are also times when a site’s ranking will remain static for a whole year.

Get your website a high PR (Page Rank)
When it comes to online business, getting a high page rank is very important. This is because this will show your site’s popularity. However, if you do not have the proper content in your site, then a high page rank might just be a dream for you. It is best if you will have web content with the proper keywords that would draw search engines to your site. The more fresh and creative and keyword-strategic your web content is, the more chances you have on getting a higher page rank.

Work on getting backlinks
Another thing that you can do to increase your page rank is to heighten the backlinks to your site. You will get a better Google Page Rank if you will have a number of sites referring back to your website. If there are a lot of sites referring to your website, this means a lot in terms of your credibility, which is also a determining factor for a page rank. While getting a great number of sites referring back to your website works better at heightening your page rank, having websites that rank higher than yours doing the referral is best.
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