+13.0+22.6 raw over 26 seasons · +0.5 a season#24 of 368
Best: 1988 DET (+8.8) · Worst: 1976 CIN (-12.5)
Team wins minus the wins its roster's VAL predicts (roster fit r² 0.77), credited by share of games coached and shrunk toward zero for short careers. Descriptive, not causal: health, schedule and luck sit in the same residual.
Built from: Lahman Baseball Database (1871–2019); MLB StatsAPI (schedule, standings, coaches by date, postseason) (2020–2026); Wikipedia — List of <club> managers (acting managers, verification) (2020–2026); Wikipedia — Major League Baseball Manager of the Year Award (2017–).