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st: ROC Curve plots

From   "Stephan Rudolfer" <>
To   "" <>
Subject   st: ROC Curve plots
Date   Mon, 13 Jul 2009 15:32:20 +0100

I am working on a database of about 3,000 patients, and wish to plot the ROC curves of various diagnostic algorithms based on logistic regression, using roctab and roccomp.  Perhaps unsurprisingly, the plots are very "fuzzy", presumably since the cutpoints generated depend on the total number of patients in the database and hence are too numerous?

My question: Is it possible to get a "cleaner" ROC curve plot?  The roc routines don't seem to allow any control of the number of cutpoints used for the ROCC.

Many thanks in advance for any help you can provide,
Stephan Rudolfer

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