Demonstration of the stratified sampling

Yihui Xie & Lijia Yu 2017-04-04

Each rectangle stands for a stratum, and the simple random sampling without replacement is performed within each stratum. The points being sampled are marked out (by red circles by default).

ani.options(nmax = 50)
par(mar = rep(1, 4), lwd = 2)
sample.strat(col = c("bisque", "white"))

plot of chunk demo-a