| sample.system {animation} | R Documentation |
The whole sample frame is denoted by a matrix (nrow * ncol) in the plane, and the sample points with equal intervals are drawn out according to a random starting point. The points being sampled are marked by red circles.
sample.system(nrow = 10, ncol = 10, size = 15,
p.col = c("blue", "red"), p.cex = c(1, 3))
nrow |
the desired number of rows of the sample frame. |
ncol |
the desired number of columns of the sample frame. |
size |
the sample size. |
p.col, p.cex |
different colors / magnification rate to annotate the population and the sample |
None (invisible `NULL').
Yihui Xie
Cochran, W G (1977) Sampling Techniques, Wiley, ISBN 0-471-16240-X
http://animation.yihui.name/samp:systematic_sampling
oopt = ani.options(interval = 1, nmax = 30)
op = par(mar = rep(1, 4), lwd = 2)
sample.system()
par(op)
## Not run:
# HTML animation page
ani.options(ani.height = 350, ani.width = 500, outdir = getwd(), nmax = 30,
interval = 1, title = "Demonstration of the systematic sampling",
description = "Sampling with equal distances.")
ani.start()
par(mar = rep(1, 4), lwd = 2)
sample.system()
ani.stop()
## End(Not run)
ani.options(oopt)