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Re: st: Poisson regression diagnostics


From   A Miranda Caso Luengo <ecrgw@csv.warwick.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Poisson regression diagnostics
Date   Wed, 16 Oct 2002 12:42:06 +0100 (GMT Daylight Time)

I think each estimation command has its own code to define the options
allowed after estimation. That is, the predict option and post-estimation
diagnostics might be different from model to model. I guess the reason is
that some diagnostics make sense in one but not in all contexts.

Alfonso.

========================================================
Alfonso Miranda
University of Warwick

Coventry, Warwickshire, UK, CV4 7AL
Tel. (44)+(02476)+76523474  
Fax: (44)+(02476)+523032  
E-mail: Alfonso.Miranda-Caso-Luengo@warwick.ac.uk
========================================================

On Wed, 16 Oct 2002, Ian Dohoo wrote:

> Stata colleagues:
> 
> Is there a particular reason why the list of diagnostic options available 
> with -predict- after poisson and negative binomial regression is so 
> limited?  I can get a much more complete set of diagnostic parameters 
> using -predict- after -glm-.  This approach is fine for poisson models, but 
> (as the Stata help points out) replicating -nbreg- results using -glm- is 
> difficult.  
> 
> Are there any differences in the way that regression diagnostics are 
> computed after -glm- to how they would be computed after -poisson-, if 
> they were available (eg. the difference in residuals between -glm- 
> (computed 1 per observation) and -logit- (computed 1 per covariate 
> pattern))?
> 
> Thanks in advance for any help with this.
> 
> Cheers
> Ian Dohoo
> 
> --------------------------------------------------------------
>                         Ian R. Dohoo,
>                  Professor - Epidemiology,
>               Department of Health Management 
>                 Atlantic Veterinary College
>                     University of P.E.I.,
>           Charlottetown, P.E.I.  C1A 4P3   CANADA
> e.mail <dohoo@upei.ca>  phone 902-566-0640   FAX 902-566-0823
> 
> "Life is full of obstacle illusions" ... Grant Frazier
> --------------------------------------------------------------
> 
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