Each pitch is compared to that pitcher's own in-season velocity baseline for that pitch type. All Seasons still uses pitcher-season-pitch-type baselines, then pools those in-season deviations so career velocity changes, aging, pitch mix, and run environment shifts are reduced.
The headline number is the magnitude of the effect per +1 mph. Bigger values mean performance is more velocity-sensitive; rows are ranked by magnitude regardless of direction.
Positive means extra velocity improves run prevention. Inverse means the pitcher has been better below his baseline. Lower xRV/100 is better, so the split columns show where the runs were prevented.
Treat this as descriptive sensitivity, not a causal proof. It does not fully control for count, location, opponent, pitch shape, fatigue, role, or health changes within the same season.
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