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標準差

方程式

其中:

s = 數列序號

i = 數列 s 中的資料點個數

m = 圖表中資料點 y 的數列序號

n = 各數列中的資料點個數

yis = 數列 s 和第 i 個點的資料值

ny = 所有數列的資料值總數

M = 算術平均值

標準誤差

方程式

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