从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 上面大意是说PERA是由EqBB9 EqERA EqH9 EqHR9 Eqk9这些指标数据推算而成， 在大联盟算出来的EqBB9=3.0 EqERA=4.50 EqH9=9.0 EqHR9=1.0 EqK9=6.0。 让小弟不懂的是， (1)这些数值是如何推算而来? (2)再算PERA时步骤为何? 假如我想算某一位大联盟投手 例Johan Santana在2008年的PERA，EqBB9，EqERA，EqH9，EqHR9，EqK9 有人能举例说明相关数值是如何试算过来的吗? 谢谢! -- ╔═══════════════╦════════╦═════╗ ║ソフトバンク,软体银行四大天王 ║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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