Hello, thank you for taking the time to read this. I am trying to calculate a fully-adjusted OR with a mixed-model procedure. For some reason, the variable SMKSTAT2CAT only shows three responses when the question has four responses. I understand that if the difference is extremely small, it may not show it. However, the p-value was significant for the variable SMKSTAT2CAT when a chi sq test was used, the confidence interval & p-value were significant for response #4 for SMKSTAT2CAT in an age-adjusted model, and there is a visibly large difference in between the two frequencies for that response compared to the other responses. In the analysis of the maximum likelihood estimates, the response is shown, but it showed this as follows: DF=0 Estimate=0 SE=. Wald Chi-sq=. Pr>Chisq=. Could anyone possibly elaborate on why the response #4 for SMKSTAT2CAT is not showing? SMKSTAT2CAT Freq: Group One: Group Two: #1 828 #2 612 #2 401 #2 361 #3 1,412 #3 1,427 #4 5,295 #4 6,173 Here is my syntax: proc logistic data= less; class smkevcat (param=ref ref='1') R_MARITLCAT (param=ref ref='1') BMIcat (param=ref ref='4') AHICOMPCAT (param=ref ref='2') SMKSTAT2CAT (param=ref ref='1') vignocat (param=ref ref='2') modnocat (param=ref ref='2') strngnocat (param=ref ref='2') SHTFLU2CAT (param=ref ref='2') SHTPNUYRCAT (param=ref ref='2') SHTHEPBCAT (param=ref ref='2') SHTHEPACAT (param=ref ref='2') SHTTDCAT (param=ref ref='2') SHTHPV2CAT (param=ref ref='2') AHCSYR8CAT (param=ref ref='2') AHCSYR9CAT (param=ref ref='2') AMDLONGRCAT (param=ref ref='0') APSPAPCAT (param=ref ref='2') APSMAMCAT (param=ref ref='2') APSCOLCAT (param=ref ref='2') ASIHIVTCAT (param=ref ref='2'); model plborn = smkevcat r_maritlcat bmicat ahicompcat smkstat2cat vignocat modnocat strngnocat shtflu2cat shtpnuyrcat shthepbcat shthepacat shttdcat shthpv2cat ahcsyr8cat ahcsyr9cat amdlongrcat apspapcat apsmamcat apscolcat asihivtcat age_p; run; Thank you for your help!
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