Pagerank Update - Decreased Rankings

[getbigyadig]

After the PR update the other day, some of my domain names gained PR (from 0 to 3 or 4) but the kw rank they held previously dropped off the map. Its clear the term pagerank is ill defined. Does anyone have any insight into this?

[asimahme]

For one of our websites with the company I currently work at, our website jumped from zero PR to a PR of 4.  I don't know how legit this "new" PR update really is, obviously as we all know we shouldn't really rely on the Google PR anymore.

[EGOL]

Its clear the term pagerank is ill defined.

I would instead say that it is"clearly defined" but  "poorly understood."  description of pagerank

PageRank is merely a measure of connectivity.  It is determined by the number of pages that link to your site, the PageRank of those pages and the number of outgoing links that the hold.

KW rank is determined by a very large number of factors.  The greenbar pagerank that you see in the toolbar may not even be used in the same form that you see for determining rankings.