I want to compare model $A$ with 5 variables and model $B$ with 3 variables. I want to use the likelihood ratio test to do this. Note that this is logistic regression. How do I do this in SAS?
See this example from the documentation which shows how to construct and compare different ROC curves for the models: http://support.sas.com/documentation/cdl/en/statug/63962/HTML/default/viewer.htm#statug_logistic_sect066.htm
Notice in the output that each model includes the -2 log L. Also notice that the final table of this output includes the chi-square values and p-values for the pairwise comparisons.