Playing with Numbers: BIPA-rtisan support

Last week we debunked the myth that one could use BABIP (Batting Average on Balls in Play) as a blanket tool to determine whether an individual hitter was due for a surge or decline in his statistical output. Because hitters tend to revert toward their own personal norm for the stat, you need to look at each hitter's own career levels in order to see if an extremely high or low BABIP is truly out of character for that particular player before making a prediction as to his future performance. However, when it comes to pitchers, it's a completely different kettle of fish.