Demonstration of the simple random sampling without replacement

Yihui Xie & Lijia Yu 2017-04-04

The whole sample frame is denoted by a matrix (nrow * ncol) in the plane just for convenience, and the points being sampled are marked out (by red circles by default). Each member of the population has an equal and known chance of being selected.

ani.options(nmax = 50)
par(mar = rep(1, 4))

plot of chunk demo-a