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)