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Thread: Need help with ROR calculation

  1. #1
    Senior Member Goatlife's Avatar
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    Need help with ROR calculation

    How can I find out Ror when DI, Score, and Standard Deviation are known. Can someone point me in the right direction?

  2. #2


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    In order to calculate RoR you need bankroll, unit size, EV and standard deviation. You can't reverse engineer all of the needed statistics from the ones you provided. I got the formula from BJA3.

  3. #3


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    Try this:

    ROR = [(1-WR/SD)]/[(1+WR/SD)]^B/SD

    WR = Win Rate
    SD = Standard Deviation
    B = Bankroll
    Casino Enemy No.1

  4. #4


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    Quote Originally Posted by smallcapgrowth View Post
    How can I find out Ror when DI, Score, and Standard Deviation are known. Can someone point me in the right direction?


    ROR(%) = 100*e^(-2/k), k= kelly ratio, e= 2.71828

    k= bet size * Var / EV / BR, BR = Bankroll, EV = expectation value, Var = variance

    ROR(%) = 100*e^(-2/k) = 100*e^( -2 * EV * BR / Var / bet size)


    For example, your game with EV = 1%, Var = 1.3, Bankroll = 1000, bet size = 5

    ROR = 100 * e^(-2 * 0.01 * 1000 / 1.3 / 5) = 4.61%
    Last edited by James989; 11-30-2017 at 06:30 AM.

  5. #5


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    Actually, he can calculate EV from DI and standard deviation (SD).

    DI = 1000 * (EV / SD), so
    EV = (DI * SD) / 1000

    So, with his bankroll and average bet size he can calculate RoR as above.
    Last edited by Gronbog; 11-30-2017 at 08:13 AM.

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