Comparing Receiver Operating Characteristic Curves using SAS?

[Gayatriv]

I am using following syntax to create compare ROC curves using SAS:

Code for multiple and Single ROC :

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FILENAME REFFILE 
'/folders/myfolders/sasuser.v94/ExcelData/ACPC/finalMCI_AD_ninsstat.xlsx';

PROC IMPORT DATAFILE=REFFILE DBMS=XLSX OUT=WORK.IMPORT;
GETNAMES=YES;
RUN;

PROC CONTENTS DATA=WORK.IMPORT;
RUN;

ODS GRAPHICS ON;

PROC LOGISTIC DATA=WORK.IMPORT PLOTS(ONLY)=ROC(ID=OBS);
MODEL GROUP(EVENT='0')=ACC_GSH_Conc PCC_GSH_Conc CINGULATE_GSH_Conc;
ROC 'ACC' ACC_GSH_Conc;
ROC 'PCC' PCC_GSH_Conc;
ROC 'CINGULATE' CINGULATE_GSH_Conc;
RUN;

PROC LOGISTIC DATA=WORK.IMPORT PLOTS(ONLY)=ROC(ID=OBS);
MODEL GROUP(EVENT='0')=ACC_GSH_Conc;
RUN;

ODS GRAPHICS OFF;

Why SAS is giving two different values for single ROC curve? When I am plotting single ROC for 'alb' AUC value is different than I got by the syntax given above for single ROC (roc 'Albumin' alb;) with multiple ROC.

[StatDave]

As was suggested in your tracking entry on this question, you should use the NOFIT option in the MODEL statement to remove the second AUC estimate that is from the MODEL statement.