Created
February 28, 2019 17:11
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incorrect standard errors when not including the full design information
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| library(survey) | |
| data(api) | |
| x <- apistrat | |
| x <- subset( x , comp.imp == 'Yes' ) | |
| dstrat_before<-svydesign(id=~1,strata=~stype, weights=~pw, data=x, fpc=~fpc) | |
| dstrat_after<-svydesign(id=~1,strata=~stype, weights=~pw, data=apistrat, fpc=~fpc) | |
| dstrat_after <- subset( dstrat_after , comp.imp == 'Yes' ) | |
| SE( svymean( ~ api00 , dstrat_after ) ) | |
| SE( svymean( ~ api00 , dstrat_before ) ) | |
@nstjhp dstrat_before is incorrect. subsetting a complex sample must happen after svydesign
Thanks for swift reply @ajdamico !
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possibly a dumb question but which one is incorrect @ajdamico ?