sampling (version 0.1)

UPpivotal: Pivotal sampling

Description

Select an unequal probability sample by means of the pivotal method (unequal probabilities, without replacement, fixed sample size).

Usage

UPpivotal(pik,eps=1e-12)

Arguments

pik

vector of prescribed inclusion probabilities.

eps

the control value, by default equal to 1e-12.

encoding

latin1

Details

Return a vector (0 and 1) of size N, where N is the population size. The value eps is used to control pik (pik>eps & pik < 1-eps).

References

Deville, J.-C. and Till�, Y. (1998), Unequal probability sampling without replacement through a splitting method, Biometrika, 85:89-101. Chauvet, G. and Till�, Y. (2004). A fast algorithm of balanced sampling. Submitted for publication.

See Also

UPrandompivotal

Examples

#define the prescribed inclusion probabilities
pik=c(0.2,0.7,0.8,0.5,0.4,0.4)
#select a sample
UPpivotal(pik)