Problem Description:    data rischio; set raffy; proc phreg data=rischio COVS(aggregate) COVM namelen=22; class centrocut(ref='0') cd4cut(ref='A') emocut(ref='A'); model follKM*statusKM(0)= centrocut emocut cd4cut cd4cut*emocut/risklimits; id centrocut; hazardratio 'cd4cut' cd4cut / diff=ref; hazardratio 'emocut' emocut / diff=ref; run;   I can not see the main effects of cd4cut and emocut. I get results only for the interactive effect. How can I get the HR for both the main effects and the interactive effect?   Thank you, R     ... View more