Dear group

I read a article about 'covariate-speific ROC curve':(below article, figure
5)
http://www.stata-journal.com/sjpdf.html?articlenum=st0155

I think author did not stratify the age group(below 30, 30~40, 40~50), but
how could authors specificity the AUC function according to certain
Age(months) level?
 Can I draw age-specific-ROC curves without stratification of Age group?

Thank you very much.

Best regards.

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