Thank you PIKAL Petr,

This is used when you have a big data base of a national sample. So, this factor is a variable that uses the sample in order to obtain information about all the people of the country.  Similar of getting a real approach about what's going on in the total population. I don't know how it is called in english (my first tonge is spanish).  Perhaps, there's a function in R, but I have not idea. 
Hope it helps.
Thanks in advance.
José



________________________________
 De: PIKAL Petr <petr.pikal@precheza.cz>

lp@r-project.org> 
Enviado: Miércoles 19 de septiembre de 2012 9:19
Asunto: RE: [R] factor expansion

Hi

I did not see any answer yet but can you explain what you mean by factor expansion? Something like expand.grid?

Petr

> -----Original Message-----
> From: r-help-bounces@r-project.org [mailto:r-help-bounces@r-
> project.org] On Behalf Of Jose Bustos Melo
> Sent: Wednesday, September 12, 2012 4:16 PM
> To: r-help@r-project.org
> Subject: [R] factor expansion
> 
> I'm trying to use a data base from SPSS and get all data representing
> the true data. I would like to use a variable as expansion data. In our
> data base we have the variable with the factor expansion, but we have
> not idea how to set it in R.
> Any idea?
> 
> Thanks in advance!
> José
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