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I have 2 questions for survey data:
1, What’s the difference between svy:tab and svy,subpop(XX): tab? if subgroup first then use svy:tab.
2, Do we have the corresponding SAS code as svy, subpop(XX): tab?
Thanks in advance for your help and time.
The subpop() option means that estimates are only computed for a single subpopulation identified by XX not equal to 0 and not missing. For a simple binary XX variable, that would be equivalent to XX==1. The reason to use subpop() is that merely adding an “if XX==1” restriction will often fail at producing the correct variance estimates for the subpopulation. However, if you’re just looking at proportions with tab, that should not make a difference since these are point estimates. You can find more details (including formulas) here. I am not sure what the equivalent SAS code is.