Use Sampford method to select a sample of units (unequal probabilities, without replacement, fixed sample size).
Usage
UPsampford(pik,eps=0.000005)
Arguments
pik
vector of prescribed inclusion probabilities.
eps
the control value, by default equal to 0.000005.
Details
Return a vector (0 and 1) of size N, where N is the population size. The value eps is used to
control pik (pik>eps & pik < 1-eps). The sample size must be small with respect to the
population size; otherwise, the selection time can be very long.
References
Sampford, M. (1967), On sampling without replacement with unequal probabilities of
selection, Biometrika, 54:499-513.