StratifiedSampling (version 0.4.1)

balstrat: Balanced Stratification

Description

Select a stratified balanced sample. The function is similar to balancedstratification of the package sampling.

Usage

balstrat(X, strata, pik)

Value

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.

Arguments

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.

Author

Raphaël Jauslin

Details

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.

References

Chauvet, G. (2009). Stratified balanced sampling. Survey Methodology, 35:115-119.

See Also

ffphase, landingRM

Examples

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