hi every one, this is the first time I learned about SAS, I am using proc logistic to compare the odds of an outcome between people who are 70 years old and who are 15 years older than them, how should I write down the code to locate the population who are 70 years old?  here is my code proc logistic data= lungcancer desc; model casecont= age/clodds=wald; where age =70; units age=15; run;   it works, but it does not give a odds ratio and includes all the observations, i know this is wrong, please help me out, please ... View more