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jjdg(½ð±Ò+1): ¸ÐлÄúµÄ¹Ø×¢ 2011-08-06 01:01:29
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ian_zhangty(½ð±Ò+4): 2011-08-06 10:36:46
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jjdg(½ð±Ò+1): ¸Ðл·ÖÏíÄãµÄ½â¾ö·½°¸ 2011-08-06 15:28:45
dubo(½ð±Ò+5, ³ÌÐòÇ¿Ìû+1): good 2011-08-21 14:01:09
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FUNCTION betai(a,b,x)
REAL betai,a,b,x
!USES betacf,gammln
REAL bt,betacf,gammln
if(x<0..or.x>1.) pause 'bad argument x in betai'
if(x==0..or.x==1.) then
  bt=0.
else
  bt=exp(gammln(a+b)-gammln(a)-gammln(b)+a*log(x)&
     +b*log(1.-x))
endif
if(x<(a+1.)/(a+b+2.)) then
  betai=bt*betacf(a,b,x)/a
  return
else
  betai=1.-bt*betacf(b,a,1.-x)/b
  return
endif
END FUNCTION betai

FUNCTION betacf(a,b,x)
INTEGER maxit
REAL betacf,a,b,x,EPS,fpmin
PARAMETER (maxit=100,EPS=3.e-7,fpmin=1.e-30)
INTEGER m,m2
REAL aa,c,d,del,h,qab,qam,qap
qab=a+b
qap=a+1.
qam=a-1.
c=1.
d=1.-qab*x/qap
if(abs(d) d=1./d
h=d
do m=1,maxit
  m2=2*m
  aa=m*(b-m)*x/((qam+m2)*(a+m2))
  d=1.+aa*d
  if(abs(d)   c=1.+aa/c
  if(abs(c)   d=1./d
  h=h*d*c
  aa=-(a+m)*(qab+m)*x/((a+m2)*(qap+m2))
  d=1.+aa*d
  if(abs(d)   c=1.+aa/c
  if(abs(c)   d=1./d
  del=d*c
  h=h*del
  if(abs(del-1.)     betacf=h
    return
  end if
end do
pause 'a or b too big, or maxit too small in betacf'
END FUNCTION betacf

FUNCTION gammln(xx)
REAL gammln,xx
INTEGER j
DOUBLE PRECISION ser,stp,tmp,x,y,cof(6)
SAVE cof,stp
DATA cof,stp/76.18009172947146d0,-86.50532032941677d0,&
     24.01409824083091d0,-1.231739572450155d0,&
         .1208650973866179d-2,-.5395239384953d-5,&
         2.5066282746310005d0/
x=xx
y=x
tmp=x+5.5d0
tmp=(x+0.5d0)*log(tmp)-tmp
ser=1.000000000190015d0
do j=1,6
  y=y+1.d0
  ser=ser+cof(j)/y
end do
gammln=tmp+log(stp*ser/x)
END FUNCTION gammln



program pvalue
        REAL df, r, t, prob
        df=17-2   ! 17 is sample size

        r=0.188446645   ! pearson coefficient
        t=(abs(r)*sqrt(df))/sqrt(1-r**2)
        prob=betai(0.5*df,0.5,df/(df+t**2))
        write (*,*) prob





end program pvalue
5Â¥2011-08-06 10:41:54
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