In sports some people believe that there is a Sports Illustrated cover jinx: teams or individual athletes featured on the cover for outstanding performance, subsequently have a bad season. One explanation for this phenomenon is regression to the mean. The prior year’s performance, which earned the cover spot, is based on a combination of skill and luck. The skill persists to the next period but the luck does not (and in fact is just as likely to turn into “bad luck”). So being featured on the...