UPrandompivotal {sampling} | R Documentation |
Select a sample by means of the pivotal method, when the order of the units in the population is random (unequal probabilities, without replacement, fixed sample size).
UPrandompivotal(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).
Deville, J.-C. and Tillé, Y. (1998),
Unequal probability sampling without replacement through a splitting method,
Biometrika, 85:89–101.
Tillé, Y. (2006), Sampling Algorithms, Springer.
#define the prescribed inclusion probabilities pik=c(0.2,0.7,0.8,0.5,0.4,0.4) #select a sample s=UPrandompivotal(pik) #the sample is (1:length(pik))[s==1]