What the 16-Game Mark Tells Us About Teams’ Futures
Early season performances are always tough to get a handle on, but on a team level, the 16-game mark is worthy of some note. In Baseball Prospectus’ 2012 book Extra Innings: More Baseball Between the Numbers (a book to which I contributed), Derek Carty — a name that should be familiar around here — found that at the 16-game mark, a team’s year-to-date record became as predictive as simply assuming they’ll finish at .500, as the largest possible sample of teams inevitably does. Through Monday, 19 teams have played at least 16 games, and 11 have played at least 17, which makes this a good time to take a closer look.
In his study, Carty examined non-strike seasons from 1962 through 2011, calculating the correlation between a team’s record after n games and its final record. After one game, for example, the correlation with teams’ final mark was just .12, while at the five-game mark it was .28, and at the 10-game mark, .42. The correlation reached .5 at the 16-game mark, rose to .52 at the 17-game mark, and so on. Carty made no mention of the likelihood of teams making the playoffs, though with changing postseason formats — including the introduction of a second Wild Card in each league starting in 2012, just when the book hit the streets — such information would be of limited utility.
To my knowledge, Carty hasn’t updated the study since publishing that, so we don’t know for sure that the 2012-18 period hasn’t altered his conclusion slightly. Since we’re not doing brain surgery here — just getting a preliminary read on where this season is heading for teams — it doesn’t matter a whole lot. I didn’t set out to re-create Carty’s study, but I did examine what 16-game performances from the two Wild Card era can tell us. Read the rest of this entry »