Google had a major PR update on 7 November 2011. There is a confusion in many minds that PR depends on which Parameters?
Now a day Monthly once Google update PR... Google PR depends upon your back links and traffic of your website..PR calculate based on link wheel,link building,traffic,etc
The main parameter of the PR is back links. Depending upon the back links used in the web page its ranking is going highly. Some of websites doesn't have good content but due to the used back links it will be ranked in the top ten of the result page.
The age оf thе domain, quality аnd originality of content, thе anchor text used, keywords іn the domain, PR of the sites linking tо you and many other factors аlso play іnto the PR calculation. It's not all аbout backlinks аnd thеre is nо simple criterion re inbound link quantity.
i think estimating or analyzing the pr analytics in higly impossible as no one is aware of the exact algorithm for PR?
There are so many parameters but mainly PR depends upon your no. of quality back links, amount of traffic, domain age etc.
Quality of back links is a huge factor when it comes to PR. As others have already mentioned, there are many other factors too.