?? ttest.c
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#include <math.h>void ttest(float data1[], unsigned long n1, float data2[], unsigned long n2, float *t, float *prob){ void avevar(float data[], unsigned long n, float *ave, float *var); float betai(float a, float b, float x); float var1,var2,svar,df,ave1,ave2; avevar(data1,n1,&ave1,&var1); avevar(data2,n2,&ave2,&var2); df=n1+n2-2; svar=((n1-1)*var1+(n2-1)*var2)/df; *t=(ave1-ave2)/sqrt(svar*(1.0/n1+1.0/n2)); *prob=betai(0.5*df,0.5,df/(df+(*t)*(*t)));}
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