Wednesday, September 29, 2010

GOOGLE PAGE RANK

GOOGLE PAGE RANK

Page rank is the numerical value that represents how important a page is on the web.

Working of PR

  • Bad incoming links dont have impact on your web page rank.
  • PR is not considered based on backlink relevancy or backlink duration.
  • Content is not taken into account, while considering PR.
  • To have a overall good PR, the PR of each inbound link is also important.
  • PR is calculated for each page individually.
  • It doesnt range from o to 10. Rather it is a floating point number.
  • It is calculated based on logarithmic scale.
  • Google update page rank every few months.
Google Page Rank


The basic formula for calculating Google page rank is

PR(A) = (1-d) + d(PR(t1)/c(t1) + ......+PR(tn)/c(tn))

Where,

PR(A) - Pages linking to the page A.
t1-tn - Pages linkink to page A.
c - No of outbound links a page have.
d - Damping factor -> 0.85

You can use the following rule of thumb to rate webpages based on their Google PR:

0 – Black listed or new websites or webpages

1 – Very low PR (not much use getting linked from such pages)

2 – Low PR (not much use getting linked from such pages)

3 – Low-average PR (not a very good linking opportunity, but still go ahead with a links exchange)

4 – Average PR (most running sites fall in this category – exchange links)

5 – Good PR (This could be a good links exchange)

6 – Very good PR (Exchanging links with this site would be like finding a rare gem)

7 and above – An excellent opportunity to get linked. Almost never comes for free.

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