* SAS code to fit spider data for Example 11.3;
 options linesize = 70;

 data spider;
   input species $ etime @@;
   cards;
 jump 20  jump 22  jump 29  jump 32  jump 40
 jump 42  jump 44  jump 46  jump 51  jump 57
 crab 21  crab 30  crab 31  crab 45  crab 55
 crab 58  crab 73  crab 81  crab 105 crab 107

  proc lifereg;
   class species;
   model etime = species / distribution=Weibull;
   model etime = / distribution=Weibull;

 run;