Google pagerank PR for dummies

Google pagerank was introduced by google to show the strength of the website popularity. Last time it was considered as a performance mesures but now different gurus have reversed opinions. But still it is a good standard of measure of any website.

How it works

PageRank is also displayed on the toolbar of your browser if you’ve installed the Google toolbar (Google toolbar). But the Toolbar PageRank only goes from 0 – 10 and seems to be something like a logarithmic scale:

Toolbar PageRank (log base 10)	Real PageRank
0	0 - 10
1	10 - 100
2	100 - 1,000
3	1,000 - 10,000
4	10,000 - 100,000
5	and so on…

What is pagerank

IPagerank is a vote by all the other pages on the Web, about how important a page is. As described above it ranges fro 0 to 10. Before going deep understand the following

1. PR(Tn) - Each page has a notion of its own self-importance. That’s “PR(T1)” for the first page in the web all the way up to “PR(Tn)” for the last page
2. C(Tn) - Each page spreads its vote out evenly amongst all of it’s outgoing links. The count, or number, of outgoing links for page 1 is “C(T1)”, “C(Tn)” for page n, and so on for all pages.
3. PR(Tn)/C(Tn) - so if our page (page A) has a backlink from page “n” the share of the vote page A will get is “PR(Tn)/C(Tn)”
4. d(… - All these fractions of votes are added together but, to stop the other pages having too much influence, this total vote is “damped down” by multiplying it by 0.85 (the factor “d”)
5. (1 - d) - The (1 – d) bit at the beginning is a bit of probability math magic so the “sum of all web pages\’ PageRanks will be one”: it adds in the bit lost by the d(…. It also means that if a page has no links to it (no backlinks) even then it will still get a small PR of 0.15 (i.e. 1 – 0.85). (Aside: the Google paper says “the sum of all pages” but they mean the “the normalised sum” – otherwise known as “the average” to you and me.

PR(A) = (1-d) + d(PR(t1)/C(t1) + … + PR(tn)/C(tn))

That’s the equation that calculates a page’s PageRank. It’s the original one that was published when PageRank was being developed, and it is probable that Google uses a variation of it but they aren’t telling us what it is. It doesn’t matter though, as this equation is good enough.

In the equation ‘t1 - tn’ are pages linking to page A, ‘C’ is the number of outbound links that a page has and ‘d’ is a damping factor, usually set to 0.85.

We can think of it in a simpler way:-

a page’s PageRank = 0.15 + 0.85 * (a “share” of the PageRank of every page that links to it)

“share” = the linking page’s PageRank divided by the number of outbound links on the page.

 Note It is hard to calculate the pr byitself as the google is doing through its intelligent alogrithm system.

Internal linking strategy

This is the way the internal linking strategy works - you link your new pages to your important pages. Do not link pages that are identical because Google will assume them as spam. Your pages or your website could be banned. Do not forget that content is the most important factor that determine PageRank. Add new pages with rich content of good quality.
Be very careful while organizing internal linking because Google indexes pages that have one or more pages on the web linked to them but at the same time in order to channel the PR of the new pages to other pages you need to have them indexed by Google.

 Outbound linking

Outbound linking is calculate links from outside of your website. The links which are from relevant website as yours posses high value and if the links are from higher pagerank sites then you are lucky. As contrary to above if the links are from lower page rank and irrelevant websites then the chances of getting favourable results is less. Reciprocal links also can kill your outbound strategy. In a new google alogrithm the links which are being bought from other sites also going to be penalize. Due to this the above equation may not give the exact pagerank picture.

Age of domain

Now a days google also considers the age of your domain. Older is the domain the more beneficial.

Sandbox 

Despite your all efforts if google thinks that your website is spam or it does not satisfy the criteria then google may put you in a sandbox list for certain keywords.

Domain goals 

What is the goal of any domain can be ascertain by its regitration period. The more the years to register for a domain can reap better results.

Update of google pagerank

Google periodically update the pagerank. If we see the previous trend it may take 3 months to six months. Recently google has just started pagerank updating on 27th of October 2007. When will be the next shift in pagerank only google knows better.

Future pagerank 

There are some online free services which predict the future pagerank of certain sites. These services are good enough for begineers or pages having low pr value but the popular websites or having higher pr may be out of their accuracy.

Conclusion 

I dont think the above google equation  works exactly to determine the page rank. There are lot of factors involved as discussed above. One should be very careful to get the desire results because the penalties of google may ruin your work within minutes.

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Tags: - Google Talk, Google-Talk

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