Posted by bhendrickson 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. 0.17 is a fine number, but it is awkward having previously claimed it was 0.32.