moment.txt

用VB实现的数据的统计描述 包括分布的矩---均值、平均差、标准差、方差和中位数的搜索、均值与方差的显著性检验等

Sub MOMENT(DATA(), N, AVE, ADEV, SDEV, VAR, SKEW, CURT)
    If N <= 1 Then
        Print " 'N must be at least 2'"
      Exit Sub
    End If
    S = 0#
    For J = 1 To N
        S = S + DATA(J)
    Next J
    AVE = S / N
    ADEV = 0#
    VAR = 0#
    SKEW = 0#
    CURT = 0#
    For J = 1 To N
        S = DATA(J) - AVE
        ADEV = ADEV + Abs(S)
        P = S * S
        VAR = VAR + P
        P = P * S
        SKEW = SKEW + P
        P = P * S
        CURT = CURT + P
    Next J
    ADEV = ADEV / N
    VAR = VAR / (N - 1)
    SDEV = Sqr(VAR)
    If VAR <> 0# Then
        SKEW = SKEW / (N * SDEV ^ 3)
        CURT = CURT / (N * VAR ^ 2) - 3#
    Else
        Print " no skew or kurtosis when zero variance"
    End If
End Sub