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9/16/2010 LDA is remarkably well correlated to SERPs, but by substantially less than I thought or claimed. Expected correlation (as measured by expected spearman's correlation coefficient over our dataset) is 0.17 instead of 0.32. I found a mistake with the calculation that produced the 0.32 score.
6/26/2010 We recently posted correlation statistics on our blog. As we will continue to make similar statistics available, I'll discuss why correlations are interesting and refute the math behind recent criticisms.
10/21/2008 A few days after new content shows up in Google, it will sometimes flicker out of the SERPS for a few hours. Apparently, this is common knowledge to some SEOs. This is not common knowledge to programmers like me, and I nearly made a tin foil hat in preparation for the googlicopters when I learned the project (Linkscape) that I'd worked on for months had disappeared from all SERPs on th...