例03-04程序.sas

SAS应用_医学统计学的例题程序及其结果,学习SAS的必备资料.

data ex3_4;
  n1=29;
  n2=32;
  m1=20.10;
  m2=16.89;
  s1=7.02;
  s2=8.46;
  ss1=s1**2*(n1-1);
  ss2=s2**2*(n2-1);
  sc2=(ss1+ss2)/(n1+n2-2);
  se=sqrt(sc2*(1/n1+1/n2));
  t=tinv(0.975,n1+n2-2);
  lclm=(m1-m2)-t*se;
  uclm=(m1-m2)+t*se;
proc print;
  var t se lclm uclm;
run;