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Thread: Formulas Thread

  1. #1
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    Formulas Thread

    Alright here's where I'd like to keep strictly formulas. Anyone can feel free to post here and ill edit this first post with more formulas that you guys add into the thread, i dont have much right now but im sure you guys will have no problem adding to the list... (When posting formulas please also define the variables as well so i can continue to update that list)

    Formula List:

    On-base percentage (OBP)
    = (H + BB + HBP) / (AB + BB + HBP + SF)

    Slugging percentage (SLG)
    = (1B) + (2B X 2) + (3B X 3) + (HR X 4) / ABs

    OPS = OBP + SLG

    wOBA = (0.72xNIBB + 0.75xHBP + 0.90x1B + 0.92xRBOE + 1.24x2B + 1.56x3B +1.95xHR) / PA

    IsoP = SLG - AVG

    Gross Production Average = (1.8 * OBP + SLG) / 4

    Gross Production Average Runs
    = PA * 1.356 * (GPA ^ 1.77)

    BABIP = (H-HR) / (AB-K-HR+SF)

    Base Runs (Hitters) = A * (B / (B + C)) + D

    Where

    A = H + BB + HBP - HR - .5*IBB
    B = (1.4*TB - .6*H - 3*HR + .1*(BB + HBP - IBB) + .9*(SB - CS - DP))*1.1
    C = AB - H + CS + DP
    D = HR

    Base Runs (Pitchers) = A * (B / (B + C)) + D

    Where

    A = H + BB - HR
    B = (1.4*(1.12*H + 4*HR) - .6*H - 3*HR + .1*BB)*1.1
    C = 3*IP
    D = HR


    Seamhead's Calculating WAR Thread

    WAR for Pitchers

    WAR for Position Players

    Where...

    H = Hit
    BB = Base on Balls (Walks)
    HBP = Hit by Pitch
    AB = At Bats
    SF = Sacrifice Flys
    TB = Total Bases
    K = Strikeout
    1B = Singles
    2B = Doubles
    3B = Triples
    HR = Homerun
    PA = Plate Appearances
    NIBB = Non Intentional Base on Balls
    RBOE = Reached Base on Error
    GPA = Gross Production Average
    Last edited by whitesoxfan83; 06-25-2009 at 06:36 PM.
    Son, you just don't get it, i'm talking bout TWTW!

  2. #2
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    IsoP = SLG-AVG much easier than that calculation.
    Free Doug

  3. #3
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    Gross Production Average- (1.8 * OBP + SLG)/4

    Gross Production Average Runs- PA * 1.356 * (GPA ^ 1.77)
    My blog- analysis of the San Francisco Giants, Baseball, and Sabermetrics.

  4. #4
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    I think you should explain GPA since most aren't familiar with it.

  5. #5
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    Quote Originally Posted by Gigantes4Life View Post
    I think you should explain GPA since most aren't familiar with it.
    GPA is simply the correct form of OPS on a batting average scale. OPS undervalues the walk, and GPA fixes that.

    Gross Production Average Runs is the conversion of GPA into runs created. All in all, it's a much simpler (and more accurate) form of Equivalent Average (EqA).
    My blog- analysis of the San Francisco Giants, Baseball, and Sabermetrics.

  6. #6
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    How about the equation for BABIP?

  7. #7
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    BABIP=(H-HR)/(AB-K-HR+SF)

    xBABIP=.15 * FB% + .24 * GB% + .73 * LD% OR LD%+.12

    The first is better.
    Last edited by Gigantes4Life; 06-24-2009 at 09:00 PM.

  8. #8
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    Base Runs (Hitters) = A * (B / (B + C)) + D

    Where

    A = H + BB + HBP - HR - .5*IBB
    B = (1.4*TB - .6*H - 3*HR + .1*(BB + HBP - IBB) + .9*(SB - CS - DP))*1.1
    C = AB - H + CS + DP
    D = HR

    Base Runs (Pitchers) = A * (B / (B + C)) + D

    Where

    A = H + BB - HR
    B = (1.4*(1.12*H + 4*HR) - .6*H - 3*HR + .1*BB)*1.1
    C = 3*IP
    D = HR
    My blog- analysis of the San Francisco Giants, Baseball, and Sabermetrics.

  9. #9
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    Equation for PECOTA?

  10. #10
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    Quote Originally Posted by zala View Post
    Equation for PECOTA?
    Not going to find it here or anywhere else. PECOTA is built on proprietary data, and there's more than one equation for it.
    My blog- analysis of the San Francisco Giants, Baseball, and Sabermetrics.

  11. #11
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    Maybe its just me, but it'd be a lot easier to understand the formulas if there was some text with each explaining what its supposed to do.

  12. #12
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    There is for the majority of them. You just have to look.

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