PageRank (PR)

PageRank (PR)
- expressed an integer between 1 and 10, and the weighting of the
search engine Google, calculated on the basis of the quantity and
quality of links that point to a page, both external and internal.
Calculation of PR with relatively high accuracy can be calculated by
the PR formula, derived from algorithms and formulas presented in the article, the creators of Google, Sergey Brin and Larry Page: PR (A) = (1 - d) + {PR (T1) / C (T1) + ... + PR (Tn) / C (Tn)} d (let's call it a formula No. 1).




Before explaining the symbols in the formula, it must be assumed that
many of the values ​​and symbols used by Google to determine PR hand,
are proprietary business secret.
Therefore, the following explanations are included only putative
definitions developed by the community positioners by experiments.

Because of the large number of sites on the Internet, as defined in
absolute PR is a convenient tool for assessing the significance of the
page (such an assessment is required, for example, in taking decisions
about placement of links on your platform). Definitely more convenient in this case is to use the Google Toolbar PageRank. It is a special plugin for your browser, showing the importance of hand expressed in whole numbers between 1 and 10 TLPR is calculated according to the formula:

TLPR * a = logbasePR


The exact value of the logarithm of the base, which is dependent on the
number of pages on the Internet and its calculation formula is the
secret of Google. Nevertheless, in view of the observations, it can be assumed that this is a value close to the number 7 In the same way for the coefficient a, located between 0 and 1, select a value first On this basis, with a fairly high degree of accuracy, the Google Toolbar PR can be calculated by this method:

TLPRlog7 (PR)

But keep in mind that Google's page ranking process uses a real PR. TLPR is created solely for the convenience of sensors.

Increase PR by the internal linking

• 
  d - the so-called damping factor, reflecting passed by the links the
  linked website (for which a calculated PR) "quantity" of its validity.
  The exact amount of this factor is not disclosed, but the observations
  show that with a high degree of accuracy can be assumed that it is 0.85
  (i.e. 85% of the validity of the party).
  According to other data, the attenuation factor measures how likely is
  the transition from the links on the links on the deployed link. Also in this case for the value of d shall be 0.85.


• n - the number of pages that are located on links on this page for which is calculated PR. - C - The total amount of external links located on the side of the link.


• T (1 to n) - number of pages maintainable. ToolBar PageRank (PageRank Toolbar)

The formula for calculating PageRank

Starting with page ranking formula (formula No. 1), we can conclude that the minimum PR website may be negative or equal to 0 If we assume that d = 0.85, a 1-d = 0.15. Thus is the conclusion that PRmin = 0.15 (the sum of the bracket in the formula No. 1 is 0).
In this way, even for the new service with quite a lot of pages and no
external links, thanks to skillful internal linking (each page has a
link to a specific page), you can get very high PR.

Example:


the number of pages of approximately 15 000, with the mandated 10
internal links leading to the home page on every page, you can get:

PR homepage = 0.15 + 15000/10 * 0.85 = 1275.15 TLPR homepage = log71275, 15 3.6 4


The importance of PR only in the early days of search engine Google PR
was the main factor influencing the ranking of sites in search results. Currently, these factors are approximately 200 However, to this day among the main parameters affecting the results, PR is one of the leading positions.