<>
I am still baffled by the problem description - is this a data management
question or are you asking a question about -logistic-? Anyway, "child_123"
could be constructed as easily as
*************
gen byte child_123=child1+child2+child3
*************
-egen, rowtotal()-, as recommended earlier, is an obvious extension which
allows you to specify a -varlist-. Also see NJC`s
http://www.stata-journal.com/article.html?article=pr0046
HTH
Martin
-----Ursprüngliche Nachricht-----
Von: [email protected]
[mailto:[email protected]] Im Auftrag von Nikolaos Pandis
Gesendet: Montag, 23. November 2009 11:49
An: [email protected]
Betreff: Re: st: combine indicator values
I would like to thank everybody for the postings.
Marten,
If I only enter child2 and child3 (independent variables) in the model how
would child1 be used as a reference for child2 and child3? Perhaps, I am not
understanding correctly how this works. Would the following command:
logistic depvar child2 child3 otherindepvar
use child1 as the reference?
If I combine the dummy vars (child 1, child2, child3) I would like the new
var child_123 to look like:
id child_123
1 1
2 1
3 1
4 3
5 2
6 1
7 3
8 2
9 1
10 3
In other words, I would like to have one variable that specifies for each id
the corresponding level for the var child123. Reference category would be
child123==1.
Many thanks,
Nick
--- On Mon, 11/23/09, Maarten buis <[email protected]> wrote:
> From: Maarten buis <[email protected]>
> Subject: Re: st: combine indicator values
> To: [email protected]
> Date: Monday, November 23, 2009, 11:56 AM
> --- On Mon, 23/11/09, Nikolaos Pandis
> wrote:
> > I have the following binary (0,1) variables:
> >
> > child1, child2 child3
> >
> > They indicate if the family has or not 1, 2, 3+
> children
> > respectively.
> >
> > I would like to enter them in a logistic model using
> the xi
> > commnad and child1 as reference, after I combined them
> into
> > 1 variable.
>
> -xi- is fine as a convenience command, but the convenience
> is
> that you don't have to create the binary variables. In
> this
> case you already have the binary variables, and -xi- is
> actually
> an "inconvenience command". I would just forget about -xi-
> and
> add the variables child2 and child3 to your logistic model,
> this
> will do exactly what -xi- would otherwise do.
>
> Hope this helps,
> Maarten
>
> --------------------------
> Maarten L. Buis
> Institut fuer Soziologie
> Universitaet Tuebingen
> Wilhelmstrasse 36
> 72074 Tuebingen
> Germany
>
> http://www.maartenbuis.nl
> --------------------------
>
>
>
>
>
>
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