How do I determine which logistic regression model from the below list, with CHD = 1 as your outcome event of interest, is the best at prediction according to the ROC Curve in sas? Model 1: Age at Start only Model 2: Sex only Model 3: Smoking Status only Model 4: Age at Start and Sex Model 5: Age at Start Smoking Status Model 6: Sex and Smoking Status ***(Do not include any interaction terms in your models)