The Case-Shiller index of San Diego home prices notched up its second monthly gain in June. Wait — wasn’t June, like, two months ago? And given that the index is based on the preceeding three months’ worth of data, doesn’t this give a better idea of the price movement in May (the middle month of the three) than June?
Yes and yes. Such lagginess is what we hate about the Case-Shiller index. What we love about it is the fact that it is an apples-to-apples comparison based on subsequent sales of the same homes. This provides a much more accurate view of home price changes than indicators like the median price, which measures how much the typical buyer is paying but doesn’t account for what he or she actually got for the money.