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st: confidence intervals for means and ratios using p-weights in SRS


From   Henrique Dantas Neder <hdneder@ufu.br>
To   statalist@hsphsun2.harvard.edu
Subject   st: confidence intervals for means and ratios using p-weights in SRS
Date   Fri, 21 Nov 2003 10:41:43 -0200

Dear all

I want to estimate confidence intervals starting from data that come from a systematic sample. For this I intend to consider this sample as approximately SRS (Simple Random Sampling). The sample is weighted with weights of the type p-weight. I cannot use the command ci to calculate confidence intervals for populacion means, because this command doesn't admit p-weights. How should I proceed? I also want to estimate ratios (for example x/y, were x is the number of unemployed people and y is the total number of persons that are employed and that are looking for a job). I tried to use the command svyratio but I am in doubt if this serves automatically when I am not using cluster sample and I only specify in the svyset the weight as pweight and I don't specify the variables PSU and STRATA. How should I proceed to estimate a relationship (x/y) when do I have a sample SRS or a systematic sample?
Thanks in advance

Henrique Neder
Universidade Federal de Uberlandia - Brazil

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