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-- Google SEO News and Discussion
---- How high will these link purchases bring my PageRank?
tedster - 9:48 pm on Oct 19, 2008 (gmt 0) Even though the toolbar show us eleven possible values for PageRank, the "real" PR number that Google uses in their calculations is carried out to many decimal places. It's not a simple "0-to-10". That number is pretty much for public entertainment purposes, with an added side benefit of branding and the other kind of PR (public relations) for Google. In the real world, Google has admitted to changing those numbers for some automated queries, just to devalue the scraping of PR data. The PageRank scale is not linear. It has been estimated that the scale is close to a base 6 logarithm. This means that a very high PR4 url would be around 6 times as powerful as a very low PR4 url. You can see how a factor like that will mess with any attempt to make a simplified guess. The amount of PR that gets voted is a fraction of the url's total PR - so it makes a significant difference if there are 10 links on the page or 20. PageRank calculations are iterative - that is, the calculation is repeated around and around the entire link map of the web. There is a "damping factor" in the formula that ensures the values will eventually approach a limit instead of flying off to infinity. PageRank is not dependent on the query terms (keywords). How Google calculates query-dependent backlink factors is not something they have said anything mathematically precise about. All the above points are based on the originally published PageRank formula. But back in January, Google did change the forumula in some way. Google reps have publicly stated that, but they have not shared any information about HOW they changed the math.
Here are some reasons that your apparently simple question cannot be given a simple answer.
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