Bookmark and Share

Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down on April 23, and its replacement, statalist.org is already up and running.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Fw: st: ROC question: STATA vs SPSS


From   Danielle Boyce <dmboyce1@yahoo.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Fw: st: ROC question: STATA vs SPSS
Date   Thu, 28 Jul 2011 19:57:56 -0700 (PDT)

Thanks. 


I re-read the footnote on my SPSS output, and as it turns out, "a. The smallest cutoff value is the minimum observed test value minus 1, and the largest cutoff value is the maximum observed test value plus 1. All the other cutoff values are the averages of two consecutive ordered observed test values."

The "test value minus 1" explains the negative value.  This is a valuable lesson to me!

Danielle



________________________________
From: Anders Alexandersson <andersalex@gmail.com>
To: statalist@hsphsun2.harvard.edu
Sent: Thursday, July 28, 2011 4:17 PM
Subject: Re: st: ROC question: STATA vs SPSS

Please provide the syntax and outputs in SPSS and Stata if you need
help with interpreting any output differences.

Anders Alexandersson
andersalex@gmail.com

On Thu, Jul 28, 2011 at 3:53 PM, Danielle Boyce <dmboyce1@yahoo.com> wrote:
> 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
>
> *
> *   For searches and help try:
> *   http://www.stata.com/help.cgi?search
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/
>

*
*   For searches and help try:
*  http://www.stata.com/help.cgi?searchhttp://www.stata.com/support/statalist/faqhttp://www.ats.ucla.edu/stat/stata/

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/


© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   Site index