Brewer sampling
Uses the Brewer's method to select a sample of units (unequal probabilities, without replacement, fixed sample size).
UPbrewer(pik,eps=1e-06)
pik |
vector of the inclusion probabilities. |
eps |
the control value, by default equal to 1e-06; it is used to control pik (pik>eps & pik < 1-eps). |
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).
Brewer, K. (1975), A simple procedure for $pi$pswor, Australian Journal of Statistics, 17:166-172.
#define the inclusion probabilities pik=c(0.2,0.7,0.8,0.5,0.4,0.4) #select a sample s=UPbrewer(pik) #the sample is (1:length(pik))[s==1]
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