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Give Your PC A Performance Boost
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Beware Of Spyware! Steps To Take To Protect Your Computer
The Internet (Part II)
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Introducing PageRank - shattering the myth
 
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Back to overview
1. Introduction
2. What is Google's secret?
3. Page Rank is about pages, not websites
4. The Page Rank Formula
5. Link farms don't work
6. Well-known websites and their PageRank
7. Don't lose your perspective!
 


 
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The Page Rank Formula



The exact details are lengthy, and far beyond what I am capable of dissecting. But the basic formula is as follows:

PR(A) = (1-d) + d (PR(T1)/C(T1) + ….. + PR (Tn)/C(Tn))

PR(A) is the PageRank of a particular page (A) - not a website as a whole.

1-d is the dampening factor, as explained below.

PR(T1) is the PageRank of the page that links to our (A) page, and C(T1) is the number of links contained on that same page.

The formula is repeated throughout every single page that contains a link to this (A) page.

Two important points to take into account. First of all, if you're thinking that the formula would in practice be an infinite loop, then you're correct. This is the very nature of the web itself, and is also why Google has introduced the so called dampening factor.

The second point concerns the way that PageRank is awarded by one page to another. The generally accepted means of understanding this is to consider that a given page has, according to its own PageRank, a certain amount of voting power. If the page in question links to five other pages, then each of the pages being linked to receive their PageRank "award" of one fifth of the original page's voting power. It's also worth noting that the number of links on a page includes a website's internal links.

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