Good afternoon! 
   
  1 I have a bit of a problem with the Survey package, but one that is more theoretical than practical. If for example on wishes to use some additional information  which comprises of 4 variables with 7, 5,5 and 5 categories (resulting in 875 post-strata if the whole crossing were to be constructed) and if only the marginal distribution of each variable is known, would it be better to rake or to calibrate? 
   
  2 Is calibrating affected by the cells with 0 frequency, as raking is?  
   
  3 when a sample is already stratified and one wishes to post stratify by other variables, do the new weights take account of the fact that the sample is stratified and that sampling weights could be determined; and what is the algorithm for determining these new weights ?
   
  Thank you and have a good day!

       
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