lcubelandingphase {BalancedSampling} | R Documentation |
Landing is done by dropping balancing variables (from rightmost column). Euclidean distance is used in the Xspread
space.
lcubelandingphase(prob,probflight,Xspread,Xbal)
prob |
vector of length N with inclusion probabilities |
probflight |
vector of length N with probabilities from flightphase |
Xspread |
matrix of (standardized) auxiliary variables of N rows and q columns |
Xbal |
matrix of balancing auxiliary variables of N rows and r columns |
Returns a vector of length N with indicators.
Grafström, A. and Tillé, Y. (2013). Doubly balanced spatial sampling with spreading and restitution of auxiliary totals. Environmetrics, 24(2), 120-131.
## Not run:
# Example 1
# Select sample
set.seed(12345);
N = 100; # population size
n = 10; # sample size
p = rep(n/N,N); # inclusion probabilities
X = cbind(runif(N),runif(N)); # matrix of auxiliary variables
pflight = lcubeflightphase(p,X,cbind(p,X)); # flight
indicators = lcubelandingphase(p,pflight,X,cbind(p,X)); # landing
# final sample
s = (1:N)[indicators==1];
## End(Not run)