Date:         Mon, 14 May 2001 12:00:39 -0400
Reply-To:     Reshama Shaikh <reshama@EMAIL.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Reshama Shaikh <reshama@EMAIL.COM>
Subject:      finding "AREA" under roc curve (4)
Content-Type: text/plain; charset=us-ascii

I am running SAS V8. What I actually need is the "AREA" under the curve. I know there is output that gives you the coordinates to plot the curve, but how do I compute the "AREA"? Also, I will need the standard error of the area since I am making comparisons with other ROC curves.

Any help is greatly appreciated.

   (1)
   Reshama Shaikh wrote:
   > Would anyone have a macro that calculates the area under the curve of
   x,y points for PROC LOGISTIC?
   (2)
   Date: Wed, 9 May 2001 14:24:07 -0700
   From: Ramzi Mrad <mradramz@WELLSFARGO.COM>
   Subject: Re: macro for ROC curve
   You don't need a macro. In the logistic, use the /ctable option after
   model=.... and output the result to a file using output out=... The file
   you output will include 2 variables, one called "_sensit_" (sensitivity)
   and the other called "_1mspec_" (1-specificity), plotting these against
   each other gives you the ROC.
   Ramzi
   (3)
   Date: Wed, 9 May 2001 13:57:57 -0700
   From: "David L. Cassell" <Cassell.David@EPAMAIL.EPA.GOV>
   Subject: Re: macro for ROC curve
   Could you tell us what version of SAS you are running? Because SAS v8
   does this for you. It's the "c" statistic that is [IIRC] part of the
   default output.
   David

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