Ballpark Factor
A multiplier that quantifies how much a specific stadium inflates or deflates run scoring compared to league average.
Like adjusting marathon times for course elevation -- a flat course time does not equal a mountain course time.
Why it matters
Ballpark factors can swing expected stats by 10-15%. Coors Field inflates everything; Oracle Park suppresses scoring.
How DMP uses this
DMP adjusts projections for ballpark effects when computing expected stat lines and P-over probabilities.
Common mistake
Ignoring park factors for player props -- a hitter's 3.5 total bases line is much easier to clear at Coors than Oracle.