+54.4+99.5 raw over 24 seasons · +2.5 a season#1 of 368
Best: 1940 CIN (+15.4) · Worst: 1935 ATL (-14.0)
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–).