Do I have enough data to start using the Kelly Formula?

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  • rory borealis
    SBR High Roller
    • 07-30-06
    • 122

    #71
    Originally posted by FourLengthsClear
    1) Strictly speaking, you are overbetting if you have more than one concurrent wager.

    2) You would need a bankroll which is 19.56% bigger in order to place wagers of the same size (in dollar terms) based on 86 concurrent events all at -105 and all with a 0.2% edge. Expressed another way your bet size per wager should be reduced to 0.1756%.

    This figure is derived by reducing the recommended risk amount for a single wager (0.21%) by that same amount for every additional wager. So for two concurrent bets the risk amount would be 0.21% multiplied by (1-0.21%) or 0.2096%. For three concurrent wagers it would be 0.2091%. Repeating that calculation another 83 times gives you the figures above.
    Thank you very, very much
    I don't mean to appear any dumber before you all than what the Good Lord originally intended, but why was the single wager amount 0.21% as opposed to 0.20%?

    Was it perhaps because I only wanted to be 97% confident and that, in and of itself, accounted for the increase?

    I was able to get the 19.56% figure you gave me by setting up a simple proportion
    Last edited by rory borealis; 01-07-12, 11:20 PM.
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    • FourLengthsClear
      SBR MVP
      • 12-29-10
      • 3808

      #72
      Originally posted by rory borealis
      Thank you very, very much
      I don't mean to appear any dumber before you all than what the Good Lord originally intended, but why was the single wager amount 0.21% as opposed to 0.20%?

      Was it perhaps because I only wanted to be 97% confident and that, in and of itself, accounted for the increase?

      I was able to get the 19.56% figure you gave me by setting up a simple proportion
      0.21% would be the risk amount and 0.20% would be to win amount at -105 based on a 0.20% edge.
      That is just the standard Kelly calculation for a single bet.

      "Confidence intervals" don't come into it because we have no data on which to base a calculation. I have simply taken your 0.2% edge as being 'gospel'.

      Fwiw betting blind on this criteria (fading the public) has been tried by many before and by all accounts tends to produce results just over 50% (i.e. not enough to beat -105 lines). I don't have data personally to confirm/deny that however.
      Comment
      • rory borealis
        SBR High Roller
        • 07-30-06
        • 122

        #73
        Originally posted by FourLengthsClear
        0.21% would be the risk amount and 0.20% would be to win amount at -105 based on a 0.20% edge.
        That is just the standard Kelly calculation for a single bet.

        "Confidence intervals" don't come into it because we have no data on which to base a calculation. I have simply taken your 0.2% edge as being 'gospel'.

        Fwiw betting blind on this criteria (fading the public) has been tried by many before and by all accounts tends to produce results just over 50% (i.e. not enough to beat -105 lines). I don't have data personally to confirm/deny that however.
        Thanks FourLenghthsClear
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