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复现 Pandas 指数加权方差
了解为什么计算指数加权方差不能正确估计方差。 作者:Adrian Letchford 译者:stmoonar 你很可能熟悉用指数加权法计算平均数的方法。指数加权平均法的原理是对较新的信息赋予较高的权重。指数加权平均法的权重如下: \displaystyle{w_t = (1…
量化
4 min
7 months ago
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