PageRank (PR) big reveal PR core formula explanation

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PageRank page level definition: PageRank is also called PR is a Google measurement of the importance of a site is a landmark theory, the 90 's became Google beyond the other search engine of the iconic theory. Why is it called PageRank? This is because the author of this theory is called "page".

Page put forward the theory of the starting point is quite a perfectionist, he said: A good site is not blown out of their own, nor false to do, is the entire Internet "election" out (the vote is the performance of the external link). But page absolutely not quite, many SEO in order to improve their website PR, their own "vote", the process of their own vote we do not elaborate, but is everywhere hair outside the chain.

Although PageRank has 500 million variables and 20 million mathematical equilibrium formulas, the core of PageRank has only one formula:

PR (A) = (d) +d (pr/c+ ...) PR/C)

Note: PR (a) refers to the PR value of page A.

PR link to the I page of page a PR value.

C page I to the number of links exported to other pages.

D A constant, Google set to 0.85. D is very simple, because there will be a special situation, such as: If a Web page visitors do not click on any one link, then the minimum PR of this page should be 0.15; If this page is not a chain of external links to the minimum of the PR of this page should be 0.15.

If you do not understand the formula above, then Maoseomao for everyone in a sentence to sum up this formula:

The PR value of page A is equal to the sum of the PR value of the import link, but the PR value of each import link is not the same, each of the PR value of the import link is the number of the PR value of this page is the amount of links everywhere.

According to this formula we have reached such a conclusion: change links must find PR value high site, export links less sites.

Here we'll do 2 to compute the problem:

1 assume www.xxxx.com pr=1 is OK, then this site altogether everywhere 35 chain, this site each export a chain of PR value?

The above is very easy, we know xxxx.com pr=1, so the PR (/C) value of the exported link should be equal to 1/35*0.85+0.15=0.17

2 Now we solve www.xxxx.com is really pr. The prerequisite is that we know that the import to the site of the PR (we temporarily use PR testing tools as a standard, this may not be allowed, but more than you can see the accuracy of a lot).

Below we use Webmaster Help to see the link to calculate the PR of the website, detect the pr=0 of the minimum weight should be 0.15, this point everybody remember.

Against the formula above:

Pr= (d) +d (pr/c+pr/c+ ...) PR/C)

=0.15+0.85 (0.15/26+0.15/2+ ...) 1/7)

≈1 (This operation is too much, I do not have time to calculate, I hope you can understand)

Summary: The PR value is an unfixed number, many testing PR tools are just estimates, the simplest way to judge the PR value of the link to the high and low, you can use to exchange the station's PR divided by its own outside the chain, you can probably judge the weight of the other side of the high and low, hoping to give the novice friend help.

If you still do not understand this formula can directly contact himself: qq1304424676

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