* Cold2 Example;
* Perform a t-test test for independence to see if a new drug makes 
  a difference in the number of subjects contract a cold;

options linesize=70 nodate pageno=1;
data cold;
   input treatment $ cold count;
   datalines;
placebo 1  31
placebo 0 109
ascorb  1  17
ascorb  0 122
;

proc print;

proc ttest;
   class treatment;
   freq count;
   var cold;

run;
quit;