On Thu, 6 Sep 2007, Tobias Verbeke wrote:
> eugen pircalabelu wrote:
>
>> I'm trying to use the survey package to get a better point of view
>> for my data, but i need some piece of advice:
>>
>> i have some data from a survey which has been stratified using 2
>> criteria: region(7 values), size of locality(5 values) Using the
>> survey pakage how can i define in a correct way this design (taking
>> into account all 4 strata not just one as in the Survey example)
>>
<snip>
> According to ?svydesign, strata is a formula.
>
> The following should work (untested):
>
> design <- svydesign(ids=~0, strata=~regiune + size_loc, data=tabel)
This would be a two-stage sample, you actually need ~interaction(regiune,
size_loc).
[this reply is just to make sure it ends up linked in the archives].
-thomas
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