Minimal support sampling
Uses the minimal support method to select a sample of units (unequal probabilities, without replacement, fixed sample size).
UPminimalsupport(pik)
pik |
vector of the 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).
Deville, J.-C., Tillé, Y. (1998), Unequal probability sampling without replacement
through a splitting method, Biometrika , 85, 89-101.
Tillé, Y. (2006), Sampling Algorithms, Springer.
############ ## Example 1 ############ #defines the prescribed inclusion probabilities pik=c(0.2,0.7,0.8,0.5,0.4,0.4) #selects a sample s=UPminimalsupport(pik) #the sample is (1:length(pik))[s==1] ############ ## Example 2 ############ data(belgianmunicipalities) Tot=belgianmunicipalities$Tot04 name=belgianmunicipalities$Commune pik=inclusionprobabilities(Tot,200) #selects a sample s=UPminimalsupport(pik) #the sample is as.vector(name[s==1])
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