UPbrewer {sampling}

Brewer sampling

Description

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

Usage

UPbrewer(pik,eps=1e-06)

Arguments

pik

vector of the inclusion probabilities.

eps

the control value, by default equal to 1e-06; it is used to control pik (pik>eps & pik < 1-eps).

Value

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).

References

Brewer, K. (1975), A simple procedure for $pi$pswor, Australian Journal of Statistics, 17:166-172.

See Also

UPsystematic

Examples

#define the 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
which(s==1)