balstrat | R Documentation |
Select a stratified balanced sample. The function is similar to balancedstratification
of the package sampling.
balstrat(X, strata, pik)
X |
A matrix of size (N x p) of auxiliary variables on which the sample must be balanced. |
strata |
A vector of integers that specifies the stratification. |
pik |
A vector of inclusion probabilities. |
The function implements the method proposed by Chauvet (2009). Firstly, a flight phase is performed on each strata. Secondly, a flight phase is applied on the whole population by aggregating the strata. Finally, a landing phase is applied by suppression of variables.
A vector with elements equal to 0 or 1. The value 1 indicates that the unit is selected while the value 0 is for rejected units.
Raphaël Jauslin raphael.jauslin@unine.ch
Chauvet, G. (2009). Stratified balanced sampling. Survey Methodology, 35:115-119.
ffphase
, landingRM
N <- 100 n <- 10 p <- 4 X <- matrix(rgamma(N*p,4,25),ncol = p) strata <- as.matrix(rep(1:n,each = N/n)) pik <- rep(n/N,N) s <- balstrat(X,strata,pik) t(X/pik)%*%s t(X/pik)%*%pik Xcat <- disj(strata) t(Xcat)%*%s t(Xcat)%*%pik
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