Re: st: CI for adjusted mean

[Rachele Capocchi <rachele.capocchi@arsanita.toscana.it>]

Thanks Maarten now I understood how I can resolve my problem, with 
regress it does work.

In the meantime I tried the predict command after anova and I have 
obtained the some results compare to regress, so maybe it could be correct.

. anova   mpg   rep78  wei, continuous(  wei)
. predict mean, xb
. summ mean

Thanks a lot, without your answers I could not continue my work !

Have a nice day,
Rachele

Rachele Capocchi
Agenzia Regionale Sanit� Toscana
"U.O. Centro Statistico Elaborazione Dati"
Sede Operativa - viale Milton,7
50134 Firenze
Tel. 055-4624354
Fax. 055-4624345 


Maarten buis ha scritto:

> --- Rachele Capocchi <rachele.capocchi@arsanita.toscana.it> wrote:
>   
> > I tried tried:
> >
> > . adjust wei, by(rep) se ci
> >
> > and I obtained the adjusted means of the groups, but I don't know how
> > I can obtain the overall mean.
> >     
> sysuse auto, clear
> recode rep78 1/2 = 3
> xi: reg mpg i.rep78 wei
> adjust wei, se ci
> adjust wei, se ci by(rep78)
>
> The problem was that anova turned rep78 into a series of dummies, but
> did not leave those dummies behind after it finished. Th variables that
> aren't mentioned anywhere in the -adjust- command are left as is, but
> if they no longer exist Stata doesn't know what to do and reports
> nothing. So doing all this explicitly in -regress-, the variables are
> left behind, and -adjust- has no problems. Notice that -regress- and 
> -anova- are in many cases completely equivalent, so nothing is lost by
> moving from -anova- to -regress-.
>
> Hope this helps,
> Maarten 
> -----------------------------------------
> Maarten L. Buis
> Department of Social Research Methodology
> Vrije Universiteit Amsterdam
> Boelelaan 1081
> 1081 HV Amsterdam
> The Netherlands
>
> visiting address:
> Buitenveldertselaan 3 (Metropolitan), room Z434
>
> +31 20 5986715
>
> http://home.fsw.vu.nl/m.buis/
> -----------------------------------------
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