從Baseball Prospectus上看到的 http://0rz.tw/n9i9A PERA is a pitcher's ERA as estimated from his peripheral statistics (EqH9, EqHR9, EqBB9, EqK9). Because it is not sensitive to the timing of batting events, PERA is less subject to luck than ERA, and is a better predictor of ERA going-forward than ERA itself. Like the rest of a pitcher's equivalent stats, his PERA is calibrated to an ideal league with an average PERA of 4.50. EqBB9 is calibrated to an ideal major league where EqBB9 = 3.0. While a major league pitcher's equivalent stats should not differ substantially from his actual numbers, a minor league pitcher's equivalent stats undergo translation and may differ significantly. Equivalent stats also adjust for park effects. EqERA is calibrated to an ideal major league where EqERA = 4.50. While a major league pitcher's equivalent stats should not differ substantially from his actual numbers, a minor league pitcher's equivalent stats undergo translation and may differ significantly. Equivalent stats also adjust for park effects, and the quality of a pitcher's defense. EqERA is conceptually identical to NRA, as used in the DT cards. EqH9 is calibrated to an ideal major league where EqH9 = 9.0. While a major league pitcher's equivalent stats should not differ substantially from his actual numbers, a minor league pitcher's equivalent stats undergo translation and may differ significantly. Equivalent stats also adjust for park effects. EqHR9 is calibrated to an ideal major league where EqHR9 = 1.0. While a major league pitcher's equivalent stats should not differ substantially from his actual numbers, a minor league pitcher's equivalent stats undergo translation and may differ significantly. Equivalent stats also adjust for park effects. EqK9 is calibrated to an ideal major league where EqK9 = 6.0. While a major league pitcher's equivalent stats should not differ substantially from his actual numbers, a minor league pitcher's equivalent stats undergo translation and may differ significantly. Equivalent stats also adjust for park effects 上面大意是說PERA是由EqBB9 EqERA EqH9 EqHR9 Eqk9這些指標數據推算而成， 在大聯盟算出來的EqBB9=3.0 EqERA=4.50 EqH9=9.0 EqHR9=1.0 EqK9=6.0。 讓小弟不懂的是， (1)這些數值是如何推算而來? (2)再算PERA時步驟為何? 假如我想算某一位大聯盟投手 例Johan Santana在2008年的PERA，EqBB9，EqERA，EqH9，EqHR9，EqK9 有人能舉例說明相關數值是如何試算過來的嗎? 謝謝! -- ╔═══════════════╦════════╦═════╗ ║ソフトバンク,軟體銀行四大天王 ║ＳＯＦＴＢＡＮＫ║ ﹦ ║ ╠═══════════════╩════════╩═════╣ ║カズミ サイトウ,トシヤ スギウチ,ナギサ アラカキ,ツヨシ ワダ ║ ║192cm,96kg 175cm,82kg 189cm,81kg 179cm,77kg ║ ╚══════════════════════════════╝ --

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