sampling (version 0.45)

UPbrewer: Brewer sampling

Description

Uses Brewer method to select a sample of units (unequal probabilities, without replacement, fixed sample size).

Usage

UPbrewer(pik,eps=1e-06)

Arguments

pik

vector of prescribed inclusion probabilities.

eps

the control value, by default equal to 1e-06.

Details

Returns a vector (with elements 0 and 1) of size N, the population size. Each element k of this vector indicates the status of unit k (1, unit k is selected in the sample; 0, otherwise). The value eps is used to control pik (pik>eps & pik < 1-eps).

References

Brewer, K. (1963), A model of systematic sampling with unequal probabilities, Australian Journal of Statistics, 5:5-13. Brewer, K. (1975), A simple procedure for $\pi$pswor, Australian Journal of Statistics, 17:166-172.

See Also

UPsystematic

Examples

#define the prescribed inclusion probabilities
pik=c(0.2,0.7,0.8,0.5,0.4,0.4)
#select a sample
s=UPbrewer(pik)
#the sample is
(1:length(pik))[s==1]