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Re: st: Grouping income variables- RECODE COMMAND


From   Maarten Buis <[email protected]>
To   [email protected]
Subject   Re: st: Grouping income variables- RECODE COMMAND
Date   Tue, 4 Feb 2014 14:58:33 +0100

On Tue, Feb 4, 2014 at 2:41 PM, Antonio Rodriguez Andres wrote:
>  Following your advice, I did inspect the correlation matrix.

As we said before: the correlation is not the problem, the missing
values are the problem.

>Even I take out the income variable from
> The regression I got the same message because other variable have missing values that are dropped after fitting the proposed model
>
> xtmixed dprt age age2 gender married separated divorced widowed eduyrs ichldhm md ihealth iuemp5yr iue
>> mp12m rgdp06[pw=dweight] if md==0 || cntry: gender , mle
> note: md omitted because of collinearity
> (29900 missing values generated)

You may have taken out the income variable, but you replaced it by a
selection on md == 0, so in your analysis sample the variable md is
still a constant...

But I will repeat again and again and again: Do not do this.

-- Maarten

---------------------------------
Maarten L. Buis
WZB
Reichpietschufer 50
10785 Berlin
Germany

http://www.maartenbuis.nl
---------------------------------
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