ABS distance: signed distance from the edge of the ball to the nearest zone edge, measured at mid-plate. Positive = ball clips/is inside zone, negative = ball misses zone.
xChall%
Model-predicted probability that this pitch would be challenged, based on pitch proximity, count, game state, and pitch characteristics.
Call LI
Call Leverage Index
cBE%
Unadjusted challenge breakeven %: minimum probability of overturn needed to justify using a challenge, based on run expectancy swing for this count/base-out state. Does not account for opportunity cost or game timing.
acBE%
Adjusted challenge breakeven %: breakeven threshold adjusted for challenge opportunity cost and game timing.
xStr%
Model-predicted probability that this pitch would be called a strike by an average umpire, based on pitch location.
Opp Cost RE
Opportunity cost (RE): potential run value lost from losing a challenge at this point in the game, accounting for remaining outs and challenges.
Opp Cost WPA
Opportunity cost (WPA): potential win probability lost from losing a challenge at this point in the game.
