SAS Support Communities

Hi everyone,    Please bear with me. I'm confused to understand Odds Ratio in Proc Glimmix with interaction. In Proc Logistic, if there is an interaction between factor A(two levels) and B(levels ≥2), Odds ratio of A will be presented in different level of B. In a word, there are different OR of A under different level of B. However, in Proc Glimmix, only one OR is presented even if there is an interaction. Here is my code are result.   proc glimmix data=mas ; where farm ne 'hy'; class season(ref='summer') treatment parity(ref='1') result farm year ; model result(event='pregnant')= season | parity | treatment / dist=binary oddsratio ; random farm year; run; As you can see, there is an interaction between treatment and parity or season. However, OR of treatment is 1.509. Why there is a difference between proc logistic and proc glimmix in the matter of OR? Thanks in advance for the help!  ... View more

How can I add confidence interval and significance like in the first plot below?. I'm using  syntax "series" in PROC SGPLOT Procedure, however can not found any statement about the interval and significance. I want to show the confidence interval and significance between two group in the second plot. Here are the codes:   proc sgplot data=text; series x=season y=Preg/group=co smoothconnect markers; run;   Hope you can help me. Thank you.     ... View more

I encountered quasi-complete separation when I used Logistic Regression. After viewing definition of quasi-complete separation and its solutions. There are still two confusions remained. 1:One of these solutions is FIRTH method. However, there came out "ERROR: Selection methods are not currently available with the FIRTH option" after I tried to use FIRTH method to solve the problem. 2:I can't found out which independent variable or a combination of several independent variables caused the separation.   Here is the program:   proc logistic data=maanshan320; class season(ref='summer') treatment result season parity; model result(event='pregnant')=season | treatment | parity | BCS / firth selection=B sls=0.11 lackfit orpvalue ; oddsratio treatment ; run;   Hope you can help me.   ... View more