標準正態概率密度函數,

在這些表達式中,

為對應的累積分佈函數,其中erf誤差函數

歐文T函數英語Owen's T function

不定積分

在這些積分中,n!!為雙階乘:若n為偶數,則等於從2到n的所有偶數的乘積;若n為奇數,則等於從1到n的所有奇數的乘積;特別地,0!! = (−1)!! = 1

定積分

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