Re: st: RE: Can't store estimates after logistic regression

[Edouard Betsem <edouardbetsem@gmail.com>]

Thanks Steve, I understand it better now. I got to go through some more 
readings.
Ed


 On 28/06/2013 15:54, Steve Samuels wrote:
> Eduoard:
>
> If you do
>
> . des _est_mod1
>
> you will see the variable label: "esample() from estimates store".
> esample() just records whether the observation was used in the analysis
>
> It  not the kind of variable needed by -roccomp-, which has syntax:
>
> . rocommp refvar classvar
>
> According to the Manual:
>
> "The two variables refvar and classvar must be numeric. The reference
> variable indicates the true state of the observation, such as diseased
> and nondiseased or normal and abnormal, and must be coded as 0 and 1.
> The rating or outcome of the diagnostic test or test modality is
> recorded in classvar, which must be at least ordinal, with higher values
> indicating higher risk."
>
> In short -estimates- is irrelevant for running -roccomp-. I suggest that you
> reread the manual entry for -roccomp-.
>
> Steve
>
> On Jun 28, 2013, at 5:54 PM, Edouard Betsem wrote:
>
> It's still not working.
> by is not allowed here and using separate returned this error code
>
> [__00000E] not found
> r(111);
>
> I'm wondering if "roccomp" can be used with "estimates"
>
> I've even renamed the _est_mod1 to mod1. It's on the editor table but I don't know why Stata can't find it
>
>             logistic tma whoall
>             est store mod1
>             rename _est_mod1 mod1
>
>             logistic tma study_2
>             est store mod2
>             rename _est_mod2 mod2
>             roccomp tma _est_mod1 _est_mod2, graph summary
>
> the estimates variables return the value "1" for all my observations.
> Wish someone can help me solve this.
> Thanks
>
> Edouard BETSEM, MD, PhD
>
>
> On 28/06/2013 00:48, Bley N'Dede wrote:
> > I am not sure but may be you should try something like
> >
> > roccomp _est_mod1 _est_mod2, graph summary by(dis)
> > ________________________________________
> > From: owner-statalist@hsphsun2.harvard.edu [owner-statalist@hsphsun2.harvard.edu] on behalf of Edouard Betsem [edouardbetsem@gmail.coou should try m]
> > Sent: Friday, June 28, 2013 7:29 AM
> > To: statalist@hsphsun2.harvard.edu
> > Subject: st: Can't store estimates
> >
> > Hi,
> > I'm trying to use roccomp commande to compare AUC for two logistic
> > models. but stata won't store my estimates.
> >
> > here are the commande lines.
> >
> > * all counts with binary
> >               logistic dis ref
> >               est store mod1
> >
> >               logistic dis stud
> >               est store mod2
> >               roccomp dis mod1 mod2, graph summary
> >
> > and this is the message i have:
> >
> > variable mod1 not found
> > r(111);
> >
> > does anyone know the reason for this?
> > Best
> > Edouard
> >
> >
> >
> >
> > --
> > Edouard BETSEM, MD, PhD
> >
> >
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