SAS 9.2 可以做多个曲线比较。用proc logistic.
proc logistic data=sasuser.birth plots(only)=roc;
model low(event='1') = mother_age phy_visit alcohol uterine_irr
hist_hyp mother_wt prev_pretrm socio
mother_age*phy_visit / nofit;
roc 'Subset Model' alcohol hist_hyp mother_wt prev_pretrm socio;
roc 'Main Effects Model' mother_age phy_visit alcohol uterine_irr
hist_hyp mother_wt prev_pretrm socio;
roc 'Interaction Model' mother_age phy_visit alcohol uterine_irr
hist_hyp mother_wt prev_pretrm socio mother_age*phy_visit;
roccontrast 'Overlay of ROC Curves' / estimate=allpairs;
title "Comparing ROC Curves";
run;

学习一下