R help - Sep 2007 - the survey package

Good afternoon!
   
  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)
   
  i have tried 
   
  design<- svydesign(ids=~0, strata= c(~regiune,~size_loc), data=tabel) # for
2 criteria
   
  and got this error
   
  Error in strata[, 1] : incorrect number of dimensions
  My "tabel" looks like this:
   
   cod          cantitate           pondere      regiune      size_loc     
size_hh        age_hhh
740            5977.604          0.9962673       1              1              
3                 52
742            13879.362         0.8674601      1              1               3
42
  743           7876.322            0.9845403       1             1             
4                 53
745            1169.084          1.1690844       1                1             
3               50
  746            4430.431          0.9845403       1                1           
3                50
751             3938.161          0.9845403       1               1             
2                 39

   
   
  What does it mean and where was i wrong? 
   
  I'm sorry for taking up your time but i don't know how to fix my
problem. Thank you!

       
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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)
>    
>   i have tried 
>    
>   design<- svydesign(ids=~0, strata= c(~regiune,~size_loc), data=tabel)
# for 2 criteria
>    
>   and got this error
>    
>   Error in strata[, 1] : incorrect number of dimensions
>   My "tabel" looks like this:
According to ?svydesign, strata is a formula.

The following should work (untested):

design <- svydesign(ids=~0, strata=~regiune + size_loc, data=tabel)

HTH,
Tobias

P.S. See http://faculty.washington.edu/tlumley/survey/
for all information relating to this package.

-- 

Tobias Verbeke - Consultant
Business & Decision Benelux
Rue de la r?volution 8
1000 Brussels - BELGIUM

+32 499 36 33 15
tobias.verbeke at businessdecision.com