* SAS code to fit minnow mortality data;

 data minnow;
    input conc mort n @@;
    cards;
 31.0  60  60   14.5  60  60   11.8  46  60
 11.2  47  60    7.5  10  60    3.9   1  60
  3.3   0  60    1.4   2  60    0.8   1  60
 
 proc probit;
    model mort/n=conc / d=logistic covb inversecl;

 run;