BalancedSampling (version 1.4)

sb: Spatial balance

Description

Calculates spatial balance of a sample subject to inclusion probabilities and auxiliary space

Usage

sb(p,x,s)

Arguments

p

vector of length N with inclusion probabilities

x

matrix of (standardized) auxiliary variables of N rows and q columns

s

the sample, vector of length n

Value

• Number, the spatial balance

References

Grafström, A., Lundström, N.L.P. and Schelin, L. (2012). Spatially balanced sampling through the Pivotal method. Biometrics 68(2), 514-520.

Examples

# check spatial balance
set.seed(1234567);
N = 500;
n = 70;
p = rep(n/N,N);
X = cbind(runif(N),runif(N));

# select lpm1 sample
s = lpm1(p,X);
# calculate balance
B = sb(p,X,s);