Re: st: is there a -regress- command equivalent to the pair matched ttest?

[Richard Goldstein <richgold@ix.netcom.com>]

While your question is not completely clear, try this; after reshaping 
to wide form, form a new variable that is the difference between the 
matched pairs on your variable of interest; if you then regress with 
only the constant on the right you will have exactly the paired t-test 
results (try it); you can then add other predictors to the regress command.

Rich

josemaria wrote:
> Dear Statalisters:
> I am not sure whether it makes sense or not, but is there a sort of 
> -regress- command that allows to conduct a pair-matched -ttest-, but 
> with other independent variables?
> I tried using -xtmixed-, but the result is not the same.
> A contrived data set could be:
> matching_identification  outcome ocasion variable_not_matched
>                        1            1                1                0
>                        1            2                2                0
>                        2            3                1                0
>                        2            5                2                1
>                        3            2                1                0
>                        3            4                2                1
>                        4            6                1                1
>                        4            5                2                1
> To perform the pair-matched ttest  it is necessary to -reshape- and to 
> use -ttest outcome1==outcome2-, losing the independent 
> variable_not_matched.
> Thank for any orientation.
> Regards,
> 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
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