Poisson sampling
Draws a Poisson sample using a prescribed vector of first-order inclusion probabilities (unequal probabilities, without replacement, random sample size).
UPpoisson(pik)
pik |
vector of the first-order inclusion probabilities. |
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). The value 'eps' is used to control pik (pik>eps & pik < 1-eps).
############ ## Example 1 ############ # definition of pik pik=c(1/3,1/3,1/3) # selects a sample s=UPpoisson(pik) #the sample is (1:length(pik))[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 getdata(name,s)
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