How to plot an average ROC curve with 95% CI

[tatte6]

Hi!

I am trying to calculate an average ROC curve from 4 separate ROC curves in SAS. I would like to plot a single average ROC Curve with 95% confidence interval in SAS. Is there also a way to obtain a mean c-statistic? There is a reference group that I would also like to compare my average ROC curve to.

Is this possible in SAS?

Thank you so much!

[ballardw]

Data. Can't make many suggestions without actual data.

We can calculate a mean Y value for multiple values of X. But if there are only 4 points at a given X then a confidence interval may be very wide if given only the curve values.

Probably a better approach would be to combine the data used to create all the ROC and then create the ROC for that combined data.

By c-statistic do you mean the c concordance index?

What do you mean by a "reference group"? Do you have yet another ROC for that group? Do you mean to display that curve along with the "mean ROC" requested?  Likely possible but again data. I think we would be combining data in some form to send to SGPLOT requesting multiple curves.