hi leandro, in case you're already familiar with ibge's pnad, you might
find these examples useful--

http://www.asdfree.com/search/label/pesquisa%20nacional%20por%20amostra%20de%20domicilios%20%28pnad%29

https://github.com/ajdamico/usgsd/tree/master/Pesquisa%20Nacional%20por%20Amostra%20de%20Domicilios

--they construct and analyze the sqlite-backed survey design that dr.
lumley is referring to



On Wed, Apr 2, 2014 at 6:58 PM, Thomas Lumley <tlumley@uw.edu> wrote:

> On Thu, Apr 3, 2014 at 2:37 AM, Leandro Marino <
> leandromarino@leandromarino.com.br> wrote:
>
> > Dear R-Users,
> >
> > I was using survey for the past years and now I am experiencing some
> > problems with scripts that was working in the past.
> >
> > We are working with big data bases so I can't put all variables that I
> will
> > use in the svydesign.
> >
>
> This was never supposed to work.
>
> The variables shouldn't take up any more room in the survey design object
> than they do anywhere else, but in any case the right solution when you
> have enough memory for the variables in a given analysis but not for all
> the variables in your dataset is to use the database-backed designs and put
> the data in something like SQLite.
>
>   -thomas
>
> --
> Thomas Lumley
> Professor of Biostatistics
> University of Auckland
>
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>
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