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Openai/69286a1e-2f50-800a-b685-0647e6b12a18
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=== 参数设成常见的“赢翻倍、亏一半”的粗化模型: === * Mwin=2M_{\text{win}}=2Mwin=2(赢时×2),Mloss=0.5M_{\text{loss}}=0.5Mloss=0.5(亏时×0.5),每次胜率 p=0.5p=0.5p=0.5。 我计算了不同交易次数 nnn 下,至少能把 10U 变到 1,000,000U 的概率与所需最小胜场 wminw_{\min}wmin: * n=10:需要 wmin=14w_{\min}=14wmin=14(不可能,因为 wmin>nw_{\min}>nwmin>n),概率 = 0。 * n=20:需要 wmin=19w_{\min}=19wmin=19,概率 ≈ 2.00×10−52.00\times10^{-5}2.00×10−5(约 0.002%)。 * n=30:需要 wmin=24w_{\min}=24wmin=24,概率 ≈ 7.15×10−47.15\times10^{-4}7.15×10−4(约 0.0715%)。 * n=40:需要 wmin=29w_{\min}=29wmin=29,概率 ≈ 0.321%0.321\%0.321%。 * n=50:需要 wmin=34w_{\min}=34wmin=34,概率 ≈ 0.767%0.767\%0.767%。 * n=100:需要 wmin=59w_{\min}=59wmin=59,概率 ≈ 4.43%4.43\%4.43%。 (我用二项分布精确求和获得上面数值。) 解读: * 即便“赢×2、输×0.5”且胜率 50%,要在有限次数内把 10U 变成 1,000,000U 仍然很难——需要在很多交易里取得非常多次赢(例如在 100 次交易中至少 59 次赢),概率仍然只有几个百分点。 * 当亏损更严重或胜率更低时,概率会急剧下降;当单次盈利倍数更高(例如赢×4)或允许更多交易次数,概率会提高。
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