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Re: st: ROC question: STATA vs SPSS

From   Richard Williams <>
To, "" <>
Subject   Re: st: ROC question: STATA vs SPSS
Date   Thu, 28 Jul 2011 16:16:23 -0500

At 02:53 PM 7/28/2011, Danielle Boyce wrote:

I usually use STATA for my data analysis, but for various reasons, ran one in SPSS first. It gave me a negative cutoff point when my data have no negative values. I re-ran in STATA and got the same AUC, but no negative cutoff, and everything else (CIs, cutoffs) are ever-so-slightly off compared to SPSS.

I'm just wondering if anyone knows why this discrepancy exists.


I don't know specifically about ROC, but often such differences are due to differences in parameterization. One program might do 0 versus 1 while another does 1 versus 0. Or, one program adds a constant while another subtracts a cutpoint. If possible, try to compare how the two programs are parameterizing things.

Richard Williams, Notre Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
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EMAIL:  Richard.A.Williams.5@ND.Edu

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