Hi, I have following two factors in my GLM. Faculty: Arts Engineering Medical Science Gender: Male Female I want to test: Ho: Difference between male and female in Arts = Differene between male and female in Science I guess I need to use Contrast or Estimate statement in SAS. Please let me know what to specify in Contrast or Estimate statement. I have my PROC GLM code as follows: proc glm data=mydata; class Faculty Gender; model y=faculty gender faculty*gender; run; Thanks & Regards Madan Gopal Kundu The INTERNET now has a personality. YOURS! See your Yahoo! Homepage. http://in.yahoo.com/