UPrandomsystematic {sampling} | R Documentation |
Select a sample using the systematic method, when the order of units in population is random (unequal probabilities, without replacement, fixed sample size).
UPrandomsystematic(pik)
pik |
vector of prescribed inclusion probabilities. |
Return a vector (with elements 0 and 1) of size N, where N is the population size. Each element k of this vector indicates the status of the unit k (1, the unit k is selected in the sample; 0, otherwise).
Madow, W.G. (1949), On the theory of systematic sampling, II, Annals of Mathematical Statistics, 20, 333-354.
#define the prescribed inclusion probabilities pik=c(0.2,0.7,0.8,0.5,0.4,0.4) #select a sample s=UPrandomsystematic(pik) #the sample is (1:length(pik))[s==1]