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並前往https://stats.stackexchange.com/questions/448999/why-square-root-of-leadtime-during-safety-stock-calculation

Why square root of leadtime during safety stock calculation

As Glen mentioned, additivity of variances when samples are independent: VAR(ND) = NVAR(D), with VAR = S^2 then S(N*D) = SQRT(N)*S(D).

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