this is a part of my assignment for other subject (Unix-system programing) . This article is about page rank algorithm used by goggle to find out relevance of page when the search query is process. i thought i might share it with you all as it describe the process how goggle process search query in simple language.Below is the summary of this article written by Ian Rogers, those who are interested can click on the link at the end of this post to read original article......
Ques1) what is Page Rank?
Ans 1) Page rank can be simply defined as one of the methods used by the Goggle to determine the relevance or importance of web-page and it changes whenever goggle does re-indexing. Page rank does not tell anything about content of size of page, the language or text.
whenever a search query is process by goggle, goggle looks at the url of the page displayed by browser striping off everything down the last "/", if the Toolbar PR of that parent exist goggle subtracts 1 from it and display Toolbar PR of this page. If Toolbar PR of that parent does not exist it jump to parent's parent's page and subtract 2 and so on all the way up to root of the site before displaying PR in Toolbar.
Page rank can also be define as vote of all the other pages on Internet, revealing about the importance of that page it is calculated by following formula.
- PR(A)=(1-d)+d(PR(T1)/C(T1)+........PR(Tn)/C(Tn)
where:-
- PR(Tn):- self importance of each page.
- C(Tn):- vote spread by page to its outgoing links.
- PR(Tn)/C(Tn)- if the page contains back links from page the share of vote that
page will get is "PR(Tn)/C(Tn). - d - this is multiplying factor
- 1-d - to keep sum of all pages equal to 1 this multiplying factor is introduced.
Total of 13 example are explained in this article from simple to complex in ascending order.Describing how PR in calculated in various scenario? and how can we increase the PR of the home page?
link:- http://www.ianrogers.net/google-page-rank/
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