How Page Rank is Accumulated
Search Engine Optimization - 24 Comments » - Posted on 十月, 2 at 4:48 上午
Page rank is accumulated from inbound links and is distributed with outbound links. The more inbound links a page has (internal and external), the higher the rank of that page, assuming all other link quality factors are met (such as the quality of the external website and the trust level).
Initial Value of the Pages
Each page is assigned an initial value, equal to a fixed number. For the purposes of this example let’s use one as the default value assigned to pages. With the effect of the dampening factor, that value goes down to by 0.15 to 0.85, thus the default page rank of each new page (or page without any inbound links) is 0.85.
This also means that new pages (or pages without links) can pass 0.85 of total page rank to other pages. It also means that by increasing the number of internal pages and by directing their links to the most important pages, you can increase your PR.
For new pages to be awarded a default page rank score, they need to meet certain quality qualifications in terms of content, format, keywords etc. In other words, you can’t create a bunch of duplicate/blank pages and raise your PR.
Page Rank Formula
I personally get a sleeping reflex at the sight of equations and formulas, but if math or physics is one of your strengths, check out the page rank formula below.
PR(A) = (1-d) + d (PR(T1)/C(T1) + … + PR(Tn)/C(Tn))
Some of the values explained:
- PR - page rank.
- A – page A
- (1-d) – dampening factors.
Conclusion
Some of the key points to remember:
- Page rank is a measure of importance, NOT relevancy
- Tool bar page rank does not give an accurate representation of page rank.
- Each page is given a default page score of 1 (or whatever Google uses internally).
In the next article we will go into detail as to how page rank works on the site wide level, the distribution of PR between pages, how to highlight important PR pages, page exclusion, the use of no follow in page rank sculpting and more.
Posted in Search Engine Optimization | 24 Comments »
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