independent t-test

proc import datafile="F:\publish\data analysis using R\data\indept_ttest.csv" out=dental dbms=csv replace;
run; 

proc ttest data=dental;
  class treatment;
  var resp;
run;

proc mixed data=dental;
  class  treatment;
  model resp=treatment;
run;

proc mixed data=dental;
  class  treatment;
  model resp=treatment / ddfm=Satterthwaite;
  repeated / group=treatment;
run;

/* ML: df is not right */
proc nlmixed data=dental;
  parms mu=100, tau=10, s2e=2;
  if (treatment=1) then eta=mu; 
                   else eta=mu+tau; 
  model resp ~ normal(eta, s2e);
run;