?? ftest.cpp
字號:
void ftest(double data1[], int n1, double data2[], int n2,
double& f, double& prob)
{
double df1,df2,dum1,dum2,ave1,ave2,var1,var2;
avevar(data1, n1, ave1, var1);
avevar(data2, n2, ave2, var2);
if (var1 > var2)
{
f = var1 / var2;
df1 = n1 - 1;
df2 = n2 - 1;
}
else
{
f = var2 / var1;
df1 = n2 - 1;
df2 = n1 - 1;
}
dum1 = betai(0.5 * df2, 0.5 * df1, df2 / (df2 + df1 * f));
dum2 = 1.0 - betai(0.5 * df1, 0.5 * df2, df1 / (df1 + df2 / f));
prob = dum1 + dum2;
}
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