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


From   Edouard Betsem <edouardbetsem@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: Can't store estimates after logistic regression
Date   Fri, 28 Jun 2013 16:40:44 -0700

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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