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zyj8119

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CODE:
#include
   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)));
   }
   void avevar(float data[],unsigned long n,float *ave,float *var)
   {
           unsigned long j;
           float s,ep;

           for(*ave=0.0,j=1;j<=n;j++)*ave+=data[j];
           *ave/=n;
           *var=ep=0.0;
           for(j=1;j<=n;j++){
                   s=data[j]-(*ave);
                   ep+=s;
                   *var+=s*s;
           }
           *var=(*var-ep*ep/n)/(n-1);
   }

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zyj8119

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ÒýÓûØÌû:
Originally posted by stephenliu89 at 2010-08-28 13:10:30:
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yalefield

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zyj8119(½ð±Ò+1):лл²ÎÓë
zyj8119(½ð±Ò+3):Ã÷°×ÁË£¬Õâ¶ÎÊÇNUMERICAL RECIPESÉϵijÌÐò¡£ 2010-08-25 21:56:53
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stephenliu89

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Email:stephenliu1989@163.com
3Â¥2010-08-28 13:10:30
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