FILENAME goptions URL "http://192.38.117.59/~linearpredictors/datafiles/goptions.sas";
%include goptions;

    
FILENAME url URL "http://192.38.117.59/~linearpredictors/datafiles/readCsl.sas";
%include url;

DATA csl; SET csl;

  /* CREATES DUMMY VARIABLES FOR TREATMENT, ASCITES
     AND THEIR INTERACTION AND FITS A SERIES OF MODELS
     TO OBTAIN MAX. LOG LIKELIHOODS */    

   prednisone=(tment=0);
   slightasc=(asc=1);
   modmarkedasc=(asc=2);
   predno=prednisone*(asc=0);   
   predslight=prednisone*slightasc;
   predmodmarked=prednisone*modmarkedasc;
RUN;

PROC PHREG DATA=csl;
   MODEL days*dc(0)=;
RUN;

PROC PHREG DATA=csl;
   MODEL days*dc(0)=prednisone;
RUN;

PROC PHREG  DATA=csl;
   MODEL days*dc(0)=slightasc modmarkedasc;
RUN;

PROC PHREG  DATA=csl;
   MODEL days*dc(0)=prednisone slightasc modmarkedasc;
RUN;


PROC PHREG DATA=csl;
   MODEL days*dc(0)=slightasc modmarkedasc
                    predno predslight predmodmarked;
RUN;

QUIT;