Thursday, September 18, 2008
Every page when created has some PR
All pages start with same PR
Links spread PR
Links never decreases PR
PR is always positive, it can’t be negative
How does Google decide a Web Page Rank?
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.
In short a Link is a “vote”, by all the other pages on the Web, about
how important a page is. A link to a page counts as a vote of support.
If there’s no link there’s no support.
Links from and to high quality and related sites have an impact on
Page Rank. If pages linking to you have a high Page Rank then your
page gains some part of their reputation.
While assigning PageRank, Google considers site age, back link
relevancy and back link duration.
Page Rank does not rank web sites as a whole, but is determined for
each page individually.
Multiple votes to one link from the same page cost as much as a single
Bad incoming links have negative impact on Page Rank.
Each inbound link is important to the overall total. Except from
banned sites, which harm.
Saturday, September 6, 2008
Google Page Rank
What is PageRank?
Page Rank is one of the mathematical methods Google uses to determine a web page’s relevancy or importance. In other words, it determines the probability of finding a page by randomly surfing the web. Actually it is numeric value of importance of a web page between 0 and more than 2 billion.
Difference between ‘Real’ PR and Toolbar PR
The Google Toolbar displays an exponential approximation of real PR.
Each move up on the Toolbar PR means Ten times increase in Actual PR which is decided by Google internally and is never disclosed.
0 – 0.25
0.25 – 2.5
2.5 – 25
25 - 250
250 – 2500
And so on….
We don’t need to know ‘Real’ PR
PR is a competition.
We need more than our competitors.
This way, even ‘Real’ PR is relative.
PR(u) = (1-d) + d* SUM(PR(v)/N(v)))
u = Linked Page
v = Linking Page
N(v) = Number of outbound link on v
d = Damping factor, normally set to 0.85