Computes the first-order inclusion probability of each unit in the population given a fixed sample size design
A vector containing the selection probabilities of a fixed size without replacement sampling design. The sum of the values of this vector must be one
A sample membership indicator matrix
The inclusion probability of the kth unit is defined as the probability that this unit will be included in a sample, it is denoted by π_k and obtained from a given sampling design as follows:
The function returns a vector of inclusion probabilities for each unit in the finite population.
Hugo Andres Gutierrez Rojas firstname.lastname@example.org
Sarndal, C-E. and Swensson, B. and Wretman, J. (1992), Model Assisted Survey Sampling. Springer.
Gutierrez, H. A. (2009), Estrategias de muestreo: Diseno de encuestas y estimacion de parametros. Editorial Universidad Santo Tomas.
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# Vector U contains the label of a population of size N=5 U <- c("Yves", "Ken", "Erik", "Sharon", "Leslie") N <- length(U) # The sample size is n=2 n <- 2 # The sample membership matrix for fixed size without replacement sampling designs Ind <- Ik(N,n) # p is the probability of selection of every sample. p <- c(0.13, 0.2, 0.15, 0.1, 0.15, 0.04, 0.02, 0.06, 0.07, 0.08) # Note that the sum of the elements of this vector is one sum(p) # Computation of the inclusion probabilities inclusion <- Pik(p, Ind) inclusion # The sum of inclusion probabilities is equal to the sample size n=2 sum(inclusion)
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