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is ERA+ a legit stat anyomre? check this

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  • JDanger
    replied
    Originally posted by brett View Post
    This is a fairly recent change. A pitcher used to get the team's entire scoring environment. I am not sure they have gone back and done this for all seasons. If they do that, they might also adjust by home field edge (roughly 7-9% fewer runs allowed on average at home than on the road I think) and even by inning which could bring relievers down and starters up.
    The custom park factors go back until 1918. I've never read anything about a home-field advantage adjustment, but it's certainly an interesting idea.

    http://www.baseball-reference.com/ab...ed_pitch.shtml

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  • brett
    replied
    Originally posted by Joltin' Joe View Post
    ERA+ is park adjusted thus it depends on which park the pitchers pitched on the road.
    This is a fairly recent change. A pitcher used to get the team's entire scoring environment. I am not sure they have gone back and done this for all seasons. If they do that, they might also adjust by home field edge (roughly 7-9% fewer runs allowed on average at home than on the road I think) and even by inning which could bring relievers down and starters up.

    Everyone keep in mind that ERA+ is not a linear measure of run prevention. A 200 ERA+ only saves twice the runs on average as a 133 ERA+, and even less for starters because the average starter allows about 110%

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  • Joltin' Joe
    replied
    ERA+ is park adjusted thus it depends on which park the pitchers pitched on the road.

    Leave a comment:


  • Blackout
    started a topic is ERA+ a legit stat anyomre? check this

    is ERA+ a legit stat anyomre? check this

    http://www.baseball-reference.com/teams/PHI/2012.shtml


    Halladay: 4.40 era = 91 ERA+

    David Herndan: 4.70 era = 90 ERA+

    Chad Qualls: 4.60 ERA = 88 ERA+


    what is going on here?

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