UPsampford {sampling}R Documentation

Sampford sampling

Description

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

Usage

UPsampford(pik,eps=0.000005)

Arguments

pik vector of prescribed inclusion probabilities.
eps the control value, by default equal to 0.000005.

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). The sample size must be small with respect to the population size; otherwise, the selection time can be very long.

References

Sampford, M. (1967), On sampling without replacement with unequal probabilities of selection, Biometrika, 54:499-513.

See Also

UPsystematic

Examples

#define the prescribed inclusion probabilities
pik=c(0.2,0.7,0.8,0.5,0.4,0.4)
UPsampford(pik)

[Package sampling version 0.2 Index]