PageRank is a measure of "importance" page, according to the search engine Google. PR depends on the number of external links on this page and on their quality (and in turn the number of external links to link pages).
Replacement Witz (Weighted Citation index) Yandex.
Page Rank is calculated by a special formula:
PR (A) = (1-d) d (PR (T1) / C (T1) ... PR (Tn) / C (Tn))
It is possible that so far the formula has undergone several modifications, but Google in the press not to report it. However, it does not matter, since the very initial equation quite well.
In this equation, <> - the page that link to page A, <> - the number of links going outward, and <> - damping factor, which is usually assigned the value 0.85.
We can write it in a simpler form:
A page's PageRank A = 0.15 0.85 * (<<share>> PageRank of each page that links to our page A) where <<share>> is nothing like PageRank link to other pages, Page A divided by the number of outgoing links from a page .
Page <<vote>> small part of his PageRank'a for each page to which it refers. Share PageRank'a, which is transmitted in the <vote>>, less than its own PageRank'a this page (ie - the value of its own PageRank'a * 0.85). This value is evenly divided between all the pages on which there are links from this page.
Lifting the PageRank (PR)
PageRank on the Internet is very appreciated. The higher the PageRank, the more expensive you can sell links from a page, and the higher the page in search engines. For example if the page has a PR 3, 1 reference to average price is 3 $, if the PR 4, the link is valued at $ 5.6, with PR 6, for example, the price of 1 links rise to $ 20-30, possibly more it depends from several other factors.
That is, if we say PR main page of your site is 6 and you sell 12 matches (do not recommend) and costs $ 25 for 1 link, the profit is $ 300 a month.
To raise the PageRank you can use the same methods as in the raising of TRC, described at:
But the most efficient way to raise the PageRank 'a page is to purchase options from the main page.
For this, there are special services, advise and services http://mainlink.ru http://www.setlink.ru. For example, if you have a PageRank of your home page now 3, and you want to raise the PR of 5, you need to buy 3.4 links from PR 6.
When searching for sites for buying links, pay attention to the number of inbound links from a page, than their smaller the better. If you say on the site for more than 15 external links, then this site does not suit you, because no good. Choose sites where less than 15, but still better than 12 external links.
Also check the manual page's PageRank before you buy, use for this service SeoMan and B 1. If all goes well, feel free to take the link, but to start no more than a month.
In the first month may result links and will not, be on the sites they must be constantly, even after the result will be achieved. If PR has risen to the desired level it should be supported, if the links will be removed, then the PR again drops.