sampling (version 2.10)

UPpoisson: Poisson sampling

Description

Draws a Poisson sample using a prescribed vector of first-order inclusion probabilities (unequal probabilities, without replacement, random sample size).

Usage

UPpoisson(pik)

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).

Arguments

pik

vector of the first-order inclusion probabilities.

See Also

inclusionprobabilities

Examples

############
## Example 1
############
# inclusion probabilities
pik=c(1/3,1/3,1/3)
# selects a sample
s=UPpoisson(pik)
#the sample is
which(s==1)
############
## Example 2
############
data(belgianmunicipalities)
Tot=belgianmunicipalities$Tot04
name=belgianmunicipalities$Commune
n=200
pik=inclusionprobabilities(Tot,n)
# select a sample
s=UPpoisson(pik)  
#the sample is
which(s==1)
# names of the selected units
getdata(name,s)