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But if X,Y,Z have the same PageRank, and they all link to A, it doesn't mean that A will get the same amount of PageRank from each page linking to it, even though they have the same PageRank.
The PageRank value for X,Y,Z will be diveded with the number of links pointing out from the specific page.
So if PageRank value for X (which is the same for Y and Z) is 1, and let's say the damping factor, is 0.85 (that's the damping factor they use in the original Backrub/Google paper [www-db.stanford.edu]), then the remaining PageRank is 0.15, if it then have 2 links pointing out from the page, and one of them is to page A, it will get a PageRank of 0.075
So the PageRank for the page is dived by the number of links pointing out.
(sure hope i'm right about this)
from that paper: PR(A) = (1-d) + d (PR(T1)/C(T1) + ... + PR(Tn)/C(Tn))
the (1-d) comes in with raw Pagerank.
The toolbar Pagerank is log scale of the raw Pagerank. The (1-d) makes no significant contribution to the total Pagerank in practice.
So if three Toolbar Pagerank 5 pages all link to A, and each have three links on their pages, the Toolbar Pagerank of A will be 0.85 (d) times the toolbar Pagerank 5.
To answer your initial question.
Yes as far as we know now, the individual Pagerank of the linking pages can be added to each other, provided you dilute them by the amount of links and you discount the dampening factor.
Because of the log scale, the three PR5 links (with each page having 3 links) give logn(n5 x d) instead of the (5 x d) from the raw PR calculation. Taking d=9 this would give roughly 4.55 using Toolbar PR versus 4.97 using raw PR.
Seriously now...I think it may well be. You spend all that time getting links and waiting for the update then find out it was a waste of time so you do it again next month and then again and again. Your wife gives you an ultimatum "its either me or the PR" thats when you know you have a problem.