Park runs factor
Run-scoring environment vs league average. 100 = neutral.
What Park runs factor means
How many runs this park has yielded vs the average ballpark. Captures HR-friendliness, gap dimensions, weather, altitude — everything.
What counts as a good Park runs factor
Higher is better — roughly 92 is poor, 100 average, 108 good, and 115 or better elite.
Also written
runs_index · runs_factor · r_index