Combined AUC

Hi everyone, I'm new here

I'm doing on my medical thesis. I have 3 variables:
A: Value of a biomarker
B: Value of a Risk score
C: Survival (binominal)

I want to draw a combined AUC for A (biomarker) +B (risk score), to see if that increase AUC of any single A or B
Could someone help me please?


Less is more. Stay pure. Stay poor.
Not versed in SPSS. Would imagine worse case you can fit all three models and output AUC values and crudely compare. I know SAS has an easy process to compare AUC's between models in their logistic regression procedures. Good luck.