Net run expectancy impact: potential RE delta if overturned, or negative opportunity cost if upheld.
Net WPA
Net win probability impact: potential WPA delta if overturned, or negative opportunity cost (WPA) if upheld.
Dist (in.)
Signed distance from the ball's edge to the nearest zone edge at midplate, in inches.
xChall%
Model predicted probability that a given pitch would be challenged.
Call LI
Leverage of the pitch limited to ball/strike outcomes. 1.0 is average; 2.0 is twice as impactful.
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%
Breakeven threshold adjusted for opportunity cost and game timing.
xStr%
Model predicted probability the pitch would be called a strike by an average umpire.
Opp Cost RE
Expected RE lost from using a challenge here, accounting for what future opportunities cost.
Opp Cost WPA
Expected win probability lost from using a challenge here, sensitive to score and inning.
