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What Is Page Rank
?
Page Rank is one of more than 100 factors Google uses in
the ranking of you website and your resulting position
on their search engine.
Page Rank is a numeric value that represents how
important a page is on the web. Google figures that when
one page links to another page, it is effectively
casting a vote for the other page. The more votes that
are cast for a page, the more important the page must
be. Also, the importance of the page that is casting the
vote determines how important the vote itself is. Google
calculates a page's importance from the votes cast for
it. How important each vote is taken into account when a
page's Page Rank is calculated.
Page Rank is Google's way of deciding a page's
importance. It matters because it is one of the factors
that determine a page's ranking in the search results.
It isn't the only factor that Google uses to rank pages,
but it is an important one.
Page Rank Algorithm
The following will give you an idea of how many inbound
links and what PR those inbound links need to be, for
you to obtain the desired Page Rank for your pages. The
following page rank algorithm equation is the
relationship between two pages X and Y, with the below
example page A receiving an inbound link from page Y.
PR-X
= (0.15) + (0.85 x PR-Y / TOL-Y)
PR-X
is the Page Rank of Page X, PR-Y is the Page Rank
of Page Y, and TOL-Y is the Total Outbound Links
of Page Y.
For
example if you get a inbound link from a page that has a
PR of 6 and on that page there is a total of 6 outbound
links (counting the one to your page), a PR of 1 will be
added to your page: 0.15 + (0.85 x
6/6) = 1. If that one inbound link adds a PR of 1
to your page, and you wanted a PR of 5 it would take 5
similar inbound links.
By
similar I mean pages that have a PR/TOL ratio of 1. That
could be a PR of 5 with 5 outbound links, or a PR of 7
with 7 out bound links and so on. A PR/TOL ratio of 1
will add to your page a PR of 1. Using the PR/TOL ratio
simplifies the Rage Rank algorithm equation and makes it
easier for you to evaluate what PR an inbound link will
add to your page.
When you are looking for inbound links just divide the
PR of the page by its outbound links and this will give
you a general idea of the PR an inbound link from that
page would give you.
How Is Page Rank
Calculated ?
To calculate the Page Rank for a page, all of its
inbound links are taken into account. These are links
from within the site and links from outside the site.
PR(X) = (1-d) + d(PR(t1)/C(t1) + ... + PR(tn)/O(tn))
That's the equation that calculates a page's Page Rank.
It's the original one that was published when Page Rank
was being developed, and it is probable that Google uses
a variation of it but they aren't telling us what it is.
It doesn't matter though, as this equation is good
enough.
In
the equation 't1 - tn' are pages linking to page X, 'O'
is the number of outbound links that a page has and 'd'
is a damping factor, usually set to 0.85.
We
can think of it in a simpler way:-
a
page's Page Rank = 0.15 + 0.85 * (a "share" of the Page
Rank of every page that links to it)
"share" = the linking page's Page Rank divided by the
number of outbound links on the page.
A
page "votes" an amount of Page Rank onto each page that
it links to. The amount of Page Rank that it has to vote
with is a little less than its own Page Rank value (its
own value * 0.85). This value is shared equally between
all the pages that it links to.
How To Improve Page
Rank ?
You get Page Rank (PR) by having backward links from
other website pages that have a higher PR rating than
your site page the link is to. The PR of your site is
updated about once of month when Google updates their
database of web pages.
For example if you have a backward link from a site that
has a PR of 5, some of that PR be will transferred from
their website to your website page they linked to. These
links are called back links. Sites with high Page Rank
will get crawled by the search engine bots more often,
and the crawls will be deeper.
While Google takes into consideration the Page Rank of
your site, high PR doesn't always equate to a higher
Search Engine Results Position (SERP). You can have
high PR and have a low SERP on a certain keyword phrase,
while some other site can have low PR but have a high
SERP on the same keyword phrase.
In your pursue for a high PR keep in mind that numerous
relevant keyword anchor text back links will get you a
higher SERP than just raw high PR and that with
numerous relevant keyword anchor text back links will
come PR.
You aim shouldn't be just for high PR, but for proper
back links that will bring with them a higher PR.
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