fpc {survey} | R Documentation

## 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)

[Package survey version 3.19 Index]