37 PR10 Pages Drop to PR9's

[bobmutch]

37 PR10 Pages Drop to PR9's
When there is a toolbar PR update lots of things change. The Search Engine forums discuss these changes and post their findings and theories and the SEO community lookings over all the changes and theorize why the different things have happened.
I keep a list of all the PR 10 Pages and Page Rank 10 Sites on the internet. This Oct 6th PR update saw 37 out of 152 PR10 pages drop to PR9's. This post takes a look at one of the theories why this has happened.

The following are the PR10s that moved to PR9s for each company. Adobe 4/51 pages, Apple 7/27 pages, Google 7/35 pages, MicroSoft 5/6 pages, w3.org 2/4 and nsf.org 1/2 pages. Beside these pages there were 11/28 sites that had their only PR10 page drop to a PR9.

One theory why this has happened is that real PageRank has a maximum value of the number of pages in Google's index. As the index gets bigger the real PageRank number increases.

Markus Sobek in his article A Survey of Google’s PageRank theorizes that the real PageRank has a maximum value of dN=(1-d) where N is the total number of web pages in the index (d is usually set to 0.85), and that a real PageRank is a manual scalation that follows a logarithmical scheme.

When the real PageRank numbers increase, the range of each of the toolbar scale units moves up. When this happens the lower range of real PageRank in each toolbar unit (except the toolbar PR1 as it covers the very bottom of the real PageRank numbers) is then covered by the toolbar PR value below. Some hold that this is why 37 PR10's slipped to PR9's in this toolbar update. (The below graphic is not to scale but gives you a visual of the theory of what has happened.)



Research is still being done to find all the new PR10 pages and new sites that have picked up PR10 pages. I will be doing a post my findings some time next week

[UKZJ007]

Excellent information there, google is making it harder to get a higher PR i see.

[Johan007]

So in theory if I take out all my forum sign links because they contain low PR I could get a total page rank boost?

[bobmutch]

Johan007:

So in theory if I take out all my forum sign links because they contain low PR I could get a total page rank boost?

Well I don't see how removing links is going to give you page rank boost or PageRank boost (not sure if you are talking PR or Ranking there). Was there some think in the post that lead you to the conclusion.

[theJack]

So in theory if I take out all my forum sign links because they contain low PR I could get a total page rank boost

No. With this theory, hypothetically, if you removed the ACTUAL pages that had your sig link, you might get a PR increase, but so would the rest of the internet. Also, when talking about billions of pages, a few hundred (or even thousand) sig links is meaningless.

It just sounds like the range for PR has expanded, and instead of making an 11, they've shifted certain people down alittle bit.

[bobmutch]

everyone: I am getting my list together for new PR10 sites and pages. Google Picked up 12 PR10 pages, NFS 2 PR10 pages and W3C.org 1 PR10 page. So 37 PR10 pages dropped down to PR9's and there are 15 new PR10 pages. I expecting to find a few more but this is all that my first scan came up with.

Sites:
Google Store Worldwide

Pages:

Google Search Application - Contact
Google Search Application
Google Search Application - CustomersGoogle Job Opportunties - Balance
Google Job Opportunties - Benefits
Google Job Opportunties - Culture
Google Job Opportunties - Inside
Google Job Opportunties - Positions
Google Job Opportunties - Reasons
Google Wireless Service
Google Store Worldwide Privacy Policy
Google Store Privacy Policy
NFS - News
NFS - Search
W3C Software License

[DOS]

Google gives its pages high pr, but made some very popular sites pr9

Noticed msn.com was pr9

[TGR]

Google has Webmasters eating out of the palm of their hand!

[bobmutch]

Dos: In this last toolbar update Google gained 12 new PR10 pages but with yahoo.com, msn.com etc they also had 7 pages drop to RP9's.