internetheaven - 8:46 am on Mar 15, 2010 (gmt 0)
Anchor text is not a factor in PageRank, so you can throw out that variable.
I may have been misunderstood. I was stating that anchor text IS a "variable" i.e. that it would be impossible to test Pagerank as a ranking factor independently of the anchor text and backlinks you get to raise that Pagerank.