Each rectangle stands for a cluster, and the simple random sampling without replacement is performed for each cluster. All points in the clusters being sampled will be drawn out.
sample.cluster(
pop = ceiling(10 * runif(10, 0.2, 1)),
size = 3,
p.col = c("blue", "red"),
p.cex = c(1, 3),
...
)None (invisible NULL).
a vector for the size of each cluster in the population.
the number of clusters to be drawn out.
different colors / magnification rate to annotate the population and the sample
other arguments passed to rect to annotate the
``clusters''
Yihui Xie
Examples at https://yihui.org/animation/example/sample-cluster/
sample, sample.simple,
sample.ratio, sample.strat,
sample.system