Small survey example

Description

The fpc data frame has 8 rows and 6 columns. It is artificial data to illustrate survey sampling estimators.

Usage

data(fpc)

Format

This data frame contains the following columns:

stratid

Stratum ids

psuid

Sampling unit ids

weight

Sampling weights

nh

number sampled per stratum

Nh

population size per stratum

x

data

Source

http://www.stata-press.com/data/r7/fpc.dta

Examples

data(fpc)
fpc

withoutfpc<-svydesign(weights=~weight, ids=~psuid, strata=~stratid, variables=~x, data=fpc, nest=TRUE)

withoutfpc
svymean(~x, withoutfpc)

withfpc<-svydesign(weights=~weight, ids=~psuid, strata=~stratid,
fpc=~Nh, variables=~x, data=fpc, nest=TRUE)

withfpc
svymean(~x, withfpc)

## Other equivalent forms 
withfpc<-svydesign(prob=~I(1/weight), ids=~psuid, strata=~stratid,
fpc=~Nh, variables=~x, data=fpc, nest=TRUE)

svymean(~x, withfpc)

withfpc<-svydesign(weights=~weight, ids=~psuid, strata=~stratid,
fpc=~I(nh/Nh), variables=~x, data=fpc, nest=TRUE)

svymean(~x, withfpc)

withfpc<-svydesign(weights=~weight, ids=~interaction(stratid,psuid),
strata=~stratid, fpc=~I(nh/Nh), variables=~x, data=fpc)

svymean(~x, withfpc)

withfpc<-svydesign(ids=~psuid, strata=~stratid, fpc=~Nh,
 variables=~x,data=fpc,nest=TRUE)

svymean(~x, withfpc)

withfpc<-svydesign(ids=~psuid, strata=~stratid,
fpc=~I(nh/Nh), variables=~x, data=fpc, nest=TRUE)

svymean(~x, withfpc)