Doubles effect
How double-friendly this park has been vs league average. 100 = neutral.
What Doubles effect means
Driven by gap depth and foul territory rather than fence height, so it often moves opposite to the home-run factor: deep parks suppress homers while turning the same batted balls into doubles.
What counts as a good Doubles effect
Higher is better — roughly 92 is poor, 100 average, 108 good, and 115 or better elite.
Also written
doubles_factor · double_index · 2b_factor · doubles_effect