If I understood your question correctly, there is no need to genrate
another variable if the child1, child2 and child3 are coded as "0" and
"1" and if they are mutally exclusive. In that case in your equation
you may iclude child2 and child3 as the independent variables. In this
situation child1 will be trated as reference category.
Thanks and regards,
RAJARAM. S
On Mon, Nov 23, 2009 at 3:26 PM, Maarten buis <[email protected]> wrote:
> --- 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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