How often does Google Update PR?

[vouge34]

1) How often does Google Update PR?
1a) Is it the same for all websites or not?
1b) If not, what matters? What are the factors influencing on that?
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[hem1234]

It is updating in every 3 months.

[symonds]

PageRank is a link analysis algorithm that assigns a numerical weighting to each element of a hyperlinked set of documents, such as the World Wide Web, with the purpose of "measuring" its relative importance within the set.

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[detta]

Google Inc. is an American public corporation, earning revenue from advertising related to its Internet search, e-mail, online mapping, office productivity, social networking, and video sharing services as well as selling advertising-free versions of the same technologies.
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