He was fooled by randomness—until he replicated his study and put it in a multilevel framework. Then he saw what was (not) going on.

An anonymous correspondent who happens to be an economist writes: I contribute to an Atlanta Braves blog and I wanted to do something for Opening Day. Here’s a very surprising regression I just ran. I took the 50 Atlanta Braves full seasons (excluding strike years and last year) and ran the OLS regression: Wins = …