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FIP (from THT Glossary)

Fielding Independent Pitching, a measure of all those things for which a pitcher is specifically responsible. The formula is (HR*13+(BB+HBP)*3-K*2)/IP, plus a league-specific factor (usually around 3.2) to round out the number to an equivalent ERA number. FIP helps you understand how well a pitcher pitched, regardless of how well his fielders fielded. FIP was invented by Tangotiger.

算法：(HR*13+(BB+HBP)*3-K*2)/IP，再加上3.2，使其平均與ERA相近，也就是說，你可以用評斷ERA的角度來看這個數據。

這個數據只用到四項資料：局數、三振、保送、被全壘打，完全掌握在投手上，和隊友的守備優劣無關，所以叫做"Fielding Independent Pitching"，比ERA更能看出投手的真正實力。