data insure;
input n c car$ age;
ln=log(n);
lines;
500 42 small 1
1200 37 medium 1
100 1 large 1
400 101 small 2
500 73 medium 2
300 14 large 2
;
       


proc genmod;
class car age;
model c=car age /dist=poisson link =log offset=ln type3 lrci;
run;


title 'example for Poisson regression';
title2 'insurance claims classified by car type( 3 levels) and age group( 2 levels) by Aitkin et al. 1989';
run;



quit;