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is ERA+ a legit stat anyomre? check this

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  • is ERA+ a legit stat anyomre? check this

    Philadelphia Phillies latest stats and more including batting stats, pitching stats, team fielding totals and more on Baseball-Reference.com



    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?

  • #2
    ERA+ is park adjusted thus it depends on which park the pitchers pitched on the road.

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    • #3
      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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      • #4
        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.

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