What is Google Page Rank?

By cavsi Category: Google Tags:

PageRank is a link analysis algorithm 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.

Google Page rank is based on back links. Back links are Links pointing to your website from another website. The more back links you have the higher your PR will be. But be carefull becose if you link to spammy sites, it could possibly lower your page rank.

The way the Google PageRank calculation works is still not 100% clear today, but I thought it might be useful to write the concept of the original mechanism down in plain English and show it using a simple example.

According to Sergey Brin and Lawrence (Larry) Page, Co-founders of Google, the PR of a webpage is calculated using this formula:

PR(A) = (1 – d) + d * SUM ((PR(I->A)/C(I))

PR(A) is the PageRank of your page A.
d is the damping factor, usually set to 0,85.
PR(I->A) is the PageRank of page I containing a link to page A.
C(I) is the number of links off page I.
PR(I->A)/C(I) is a PR-value page A receives from page I.
SUM (PR(I->A)/C(I)) is the sum of all PR-values page A receives from pages with links to page A..

In other words:

The PR of a page is determined by the PR of every page I that has a link to page A. For every page I that points to page A, the PR of page I is devided by the number of links from page I. These values are cumulated and multiplied by 0,85. Finally 0,15 is added to this result, and this number represents the PR of page A.

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