FIP- is a park-adjusted version of FIP
fipminus(FIP, ParkFactor, LeagueFIP)
League Average FIP
League Average is set to 100 each season. Each point below or above 100 is one percentage point better or worse than league average.
Returns a value equal to (FIP+(FIP-(FIP*(ParkFactor/100))))/(LeagueFIP)*100
Park Factors can be found in the references section
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