Re: st: Missing outcome variables - how to deal with these? OR moels and reality

["jmpsouza" <jmpsouza@usp.br>]

Thank you, Maarten.
José Maria
Jose Maria Pacheco de Souza, Professor Titular (aposentado)
Departamento de Epidemiologia/Faculdade de Saude Publica, USP
Av. Dr. Arnaldo, 715
01246-904  -  S. Paulo/SP - Brasil
fones (11)3061-7747; (11)3768-8612
fax (11)3714-2403
www.fsp.usp.br/~jmpsouza
----- Original Message ----- 
From: "Maarten buis" <maartenbuis@yahoo.co.uk>
To: <statalist@hsphsun2.harvard.edu>
Sent: Monday, May 25, 2009 4:43 AM
Subject: Re: st: Missing outcome variables - how to deal with these? OR 
moels and reality


> -----------------------------------------
> Maarten L. Buis
> Institut fuer Soziologie
> Universitaet Tuebingen
> Wilhelmstrasse 36
> 72074 Tuebingen
> Germany
>
> http://home.fsw.vu.nl/m.buis/
> -----------------------------------------
>
>
> --- On Sun, 24/5/09, jmpsouza wrote:
> > may I present a situation very usual, indeed one that
> > already happened to me, a possible way to handle it and the
> > question whether the conduct is reasonable:
> > 1. the data come from official registry;
> > 2. the outcome is birth weigth, coded 0 for normal and 1
> > for low, no missing;
> > 3. the model is logistic (just for simplify, since it
> > was used glm poisson robust as an estimate of the prevalence
> > ratios);
> > 4. var1, var2, var3, var4 with very very few missings
> > (let´s say less than 2%);
> > 5. var5, with 4 categories, but with about 20% missing
> > answers;
> > 6. var6, same as var5;
> > 7. var5 received then 5 categories: 1 , 2 , 3 , 4,
> > the same original ones and 5, when missing;
> > 8. tab(var5), gen(var5);
> > 9. same for var6;
> > 10. any of var51 or var52 or var53 or var54 is used as
> > reference, the others, including var55 are in the command ;
> > 11. same for var 61, var62 etc.
> > 12. the command is logistic weigth var1 var2 var3
> > var4 var52 var53 var54 var55 var62 var63 var64 var65;
> > 13. in the analysis var55 and var65 are placeholders, but
> > their odds ratios may be useful.
> > The question: may this be used, is it too difficult to
> > accept? Is it a situation for using -ice-?
>
> The problem with this method is explained here:
>
> http://www.stata.com/statalist/archive/2007-12/msg00030.html
>
> Hope this helps,
> Maarten
>
>
>
>
>
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