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Re: st: RE: RE: RE: RE: Table of cut-offs for ROC following logit


From   "Ploutz-Snyder, Robert (JSC-SK)[USRA]" <robert.ploutz-snyder-1@nasa.gov>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: RE: RE: RE: RE: Table of cut-offs for ROC following logit
Date   Tue, 30 Mar 2010 12:15:30 -0500

Yup. Without it, no table. With it gives sens and spec and LR+ and  
LR-  per cut-points.

On Mar 30, 2010, at 12:08 PM, "Martin Weiss" <martin.weiss1@gmx.de>  
wrote:

>
> <>
>
> Glad it worked out for you! Does -rocfit- really have a -detail-  
> option?
>
>
> HTH
> Martin
>
>
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner- 
> statalist@hsphsun2.harvard.edu] On Behalf Of Ploutz-Snyder, Robert  
> (JSC-SK)[USRA]
> Sent: Dienstag, 30. März 2010 18:59
> To: statalist@hsphsun2.harvard.edu
> Subject: st: RE: RE: RE: Table of cut-offs for ROC following logit
>
> Thanks for the lead on Roger's senspec Martin.  That led me to  
> roctab, which in combination with the predict post-estimation  
> command to logit, works:
>
> logit y var1 var2 var3 ...  vark            *to get the logit model
>
> predict hat, pr                          *to get predicted  
> probabilities of the outcome
>
> rocfit y hat, detail                    *generates the table of  
> sens, spec, varying the cut-point
>
>
>
>
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner- 
> statalist@hsphsun2.harvard.edu] On Behalf Of Ploutz-Snyder, Robert  
> (JSC-SK)[USRA]
> Sent: Tuesday, March 30, 2010 11:44 AM
> To: statalist@hsphsun2.harvard.edu
> Subject: st: RE: RE: Table of cut-offs for ROC following logit
>
> Doesn't that require a single predictor, plus dichotomous outcome?
> I'm running a multiple logistic to predict the dichotomous outcome...
>
>
>
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner- 
> statalist@hsphsun2.harvard.edu] On Behalf Of Martin Weiss
> Sent: Tuesday, March 30, 2010 11:38 AM
> To: statalist@hsphsun2.harvard.edu
> Subject: st: RE: Table of cut-offs for ROC following logit
>
>
> <>
>
> " What am I missing??"
>
>
>
> Roger`s
>
> *******
> ssc d senspec
> *******
> ?
>
> HTH
> Martin
>
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner- 
> statalist@hsphsun2.harvard.edu] On Behalf Of Ploutz-Snyder, Robert  
> (JSC-SK)[USRA]
> Sent: Dienstag, 30. März 2010 18:29
> To: statalist@hsphsun2.harvard.edu
> Subject: st: Table of cut-offs for ROC following logit
>
> I wish to obtain a table of cut-offs and associated sensitivity,  
> specificity (and ppv, npv, fp, fn if possible) following a logit  
> analysis.  I can use lsens to graph the relationship between  
> sensitivity and specificity, given probability cutoffs shown on the  
> x axis, but what I really want is the data that was used to create  
> that lsens graph.
>
> Seems this should be an option to lsens or perhaps estat class, but  
> I can't locate it.
>
> What am I missing??
>
> Thanks much,
> Rob
>
> Robert J. Ploutz-Snyder, PhD
> Senior Research Scientist III (Biostatistician), University Space  
> Research
> Research Associate Professor, Department of Medicine, SUNY Upstate  
> Medical University
> Human  Adaptation & Countermeasures Division
> National Aeronautics and Space Administration
> Lyndon B. Johnson Space Center /SK
> 2101 NASA Parkway
> Houston, TX 77058
> 281-483-6296 (office)
> 281-483-2888 (fax)
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