Park Factors

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Park Factors (often abbreviated PF) are any effort to state the effect of a specific ballpark on some aspect of the game mathematically. The most commonly used Park Factors are for runs scored and home runs. Park factors for events other than runs are commonly referred to as "component park factors". Park factors can be expressed either as ratios of expectations in the park to an average park, or as a difference between the two.

Another term that is sometimes when used when discussing parks is "park effect". Generally, "park effect" refers to the phenomenon, and "park factor" refers to an attempt to express the magnitude of the park effect mathematically.