How is PageRank calculated?
In simplest terms PR is calculated by the sharing of PR from all the IBL links to your page. This is not strictly accurate because Google also uses the internal links within a site in the calculation of PR. Each link to a page carries with it and passes PR value to the target page. The PR points or value passed depend on the PR value of the page they come from, and the total outbound links from the page. It is generally agreed that a page will only pass about 85% of its value to the page it links to. So a PR5 page with a single outbound link will pass 85% of the value of a PR5 page to the page it links to.
But virtually no page has only a single link -- remember internal links are also used in the total outbound link count -- so the value passed to any page is 85% of the PR, divided by the total number of outbound links.
The question now becomes what is the PR point value of the different PR levels. Most observers believe that the relationship between PR levels is logarithmic rather than linear. In other words PR5 is not worth 25% more than a PR4, but may be worth 4 to 6 times more.
It is also understood that a PR value is not a single number, but is in fact a range of values. So not all PR6 ranked pages are equal. As the chart below shows a PR6 maybe just on the upper boundary of a PR5 or it maybe just short of the entry point for a PR7.
The chart that follows shows the range for each PR value. It also shows how much PR value or PR points a page with 50 outbound links will pass depending on of its own PR rank. From this I have calculated the number of links required from each value of PageRank necessary for a page to attain a desired page rank.
Source
But virtually no page has only a single link -- remember internal links are also used in the total outbound link count -- so the value passed to any page is 85% of the PR, divided by the total number of outbound links.
The question now becomes what is the PR point value of the different PR levels. Most observers believe that the relationship between PR levels is logarithmic rather than linear. In other words PR5 is not worth 25% more than a PR4, but may be worth 4 to 6 times more.
It is also understood that a PR value is not a single number, but is in fact a range of values. So not all PR6 ranked pages are equal. As the chart below shows a PR6 maybe just on the upper boundary of a PR5 or it maybe just short of the entry point for a PR7.
The chart that follows shows the range for each PR value. It also shows how much PR value or PR points a page with 50 outbound links will pass depending on of its own PR rank. From this I have calculated the number of links required from each value of PageRank necessary for a page to attain a desired page rank.
Source
posted by Mihaita at
2:07 PM
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