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Fielding Independent Pitching or FIP, was developed by Tom Tango based on DIPS work by Voros McCracken.
Strike Zone ERA, or kwERA, was developed by Tom Tango, with inspiration from GuyM.
Weighted On Base Average, or wOBA, was developed by Tom Tango. RotoValue uses Version 2, but ignoring reached base on error before 2015.

Sat 2-Aug-2025 23:05:57