TheMadScientist - 2:53 am on Apr 22, 2011 (gmt 0)
Yeah, this is a great thread.
I think this is probably a good time to clarify 'document' can refer to a page or collection of pages, and could easily be both, imo. EG A page is an individual document and can be evaluated individually, but a site (or imo, even a 'section' of a site) is also a document and can be evaluated as collective whole.
I would guess you're right about classifications not happening as often tedster and, of course, if only a portion of pages (sub-documents?) are changed you could end up with the same overall evaluation of the document (site) as a whole, even though there have been changes to a portion of it.
Plus, if it's 'happy user' based as Brett has outlined, imo, there would have to be time to build a 'new history of happy users' before an override of the previous pattern would kick in for a site's or page's rankings.