?? ftest.c
字號:
void ftest(data1,n1,data2,n2,f,prob)
float data1[],data2[],*f,*prob;
int n1,n2;
{
float var1,var2,ave1,ave2,df1,df2;
void avevar();
float betai();
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;
}
*prob = 2.0*betai(0.5*df2,0.5*df1,df2/(df2+df1*(*f)));
if (*prob > 1.0) *prob=2.0-*prob;
}
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