UPopips {sampling}

Order pips sampling

Description

Implements order \pi ps sampling (unequal probabilities, without replacement, fixed sample size).

Usage

UPopips(lambda,type=c("pareto","uniform","exponential"))

Arguments

lambda

vector of working inclusion probabilities or target ones.

type

the type of order sampling (pareto, uniform, exponential).

Value

Returns a vector of the selected units; its length is equal to the sample size.

References

Rosén, B. (1997), Asymptotic theory for order sampling, Journal of Statistical Planning and Inference, 62:135-158.
Rosén, B. (1997), On sampling with probability proportional to size, Journal of Statistical Planning and Inference, 62:159-191.

See Also

inclusionprobabilities

Examples

#define the working inclusion probabilities
lambda=c(0.2,0.7,0.8,0.5,0.4,0.4)
#draw a Pareto sample
s=UPopips(lambda, type="pareto")
#the sample is
s