st: multiple ROCs on 1 graph

["susan charman" <susan@stats.ucl.ac.uk>]

Dear colleagues

I am trying to produce 3 ROC on 1 graph. I am using

roctab ... ...., graph

to generate the plots as I am doing non-parametric analysis. I cannot seem
to find a way of puuting three plots on q axis. Have attempted addplot but
no luck so far. Any help would be appreciated.

I am using STATA V9.0 for windows.

Thanks
Susan

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