A 2010 study conducted by Dave Allen over at The Baseball Analysts suggested that all else equal, pitchers should try to avoid throwing their changeups to same-handed hitters and should be more willing to throw their changeups to opposite-handed hitters. 2010 was nearly a decade ago and baseball statistics, technology, and data manipulation have come quite far since then, so we figured we would investigate Allen’s claim that a changeup thrown to an opposite-handed hitter should be more effective than one thrown to a same-handed hitter. What we found was not what we expected.