R: Subset of survey

subset.survey.design {survey}

R Documentation

Subset of survey

Description

Restrict a survey design to a subpopulation, keeping the original design information about number of clusters, strata. If the design has no post-stratification or calibration data the subset will use proportionately less memory.

Usage

## S3 method for class 'survey.design':
subset(x, subset, ...)
## S3 method for class 'svyrep.design':
subset(x, subset, ...)

Arguments

`x`	A survey design object
`subset`	An expression specifying the subpopulation
`...`	Arguments not used by this method

Value

A new survey design object

Examples

data(fpc)
dfpc<-svydesign(id=~psuid,strat=~stratid,weight=~weight,data=fpc,nest=TRUE)
dsub<-subset(dfpc,x>4)
summary(dsub)
svymean(~x,design=dsub)

## These should give the same domain estimates and standard errors
svyby(~x,~I(x>4),design=dfpc, svymean)
summary(svyglm(x~I(x>4)+0,design=dfpc))

data(api)
dclus1<-svydesign(id=~dnum, weights=~pw, data=apiclus1, fpc=~fpc)
rclus1<-as.svrepdesign(dclus1)
svymean(~enroll, subset(dclus1, sch.wide=="Yes" & comp.imp=="Yes"))
svymean(~enroll, subset(rclus1, sch.wide=="Yes" & comp.imp=="Yes"))