Regression, or regression to the mean, is not something that is typically talked about in non-saber baseball forums and blogs, in my experience. The basic concept is that players will have times when they will play above their skill level, and because of things like a small sample size or a player have a stretch of good luck, their numbers will be better than their actual skill level. As that sample size increases, however, the luck will run out or the stretch of playing over their heads will end, and their numbers will start to trend back towards their actual [...]
