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Re: st: ROC question: STATA vs SPSS


From   Ricardo Ovaldia <ovaldia@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: ROC question: STATA vs SPSS
Date   Thu, 28 Jul 2011 14:23:19 -0700 (PDT)

Not absolutely sure, but if you code the response 0,1 or 1,0 it may flip the curves.

Ricardo

Ricardo Ovaldia, MS
Statistician 
Oklahoma City, OK


--- On Thu, 7/28/11, Danielle Boyce <dmboyce1@yahoo.com> wrote:

> From: Danielle Boyce <dmboyce1@yahoo.com>
> Subject: st: ROC question:  STATA vs SPSS
> To: "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
> Date: Thursday, July 28, 2011, 2:53 PM
> Hi,
> 
> 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.
> 
> Thanks!
> Danielle
> 
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