• stripchart(urb) Simple dotplot
• stripchart(urb ~ continents)dotplot by continent
• stripchart(urb, method="jitter") jittered dotplot, instead of default overplot.
• stripchart(urb, method="stack")stacked dotplot, instead of default overplot.
• stripchart(urb,pch=20 uses plot symbol (marker 20). pch is a general graphical argument, available for most graphical functions. To see what is available see the documentation. 20 is a small filled circle, 21 a bigger circle, 22 a square, 23 a diamond...
• It is often useful to get information about data density with another graph, e.g. a histogram.

  hist(urb)
  rug(urb)
  

  rug() adds a rug ("bar-code") to the histogram.

The lattice library lets you produce Dotplots using the dotplot function

• dotplot(urb)
• dotplot(urb ~continents) same by continent

• beeswarm plot from library beeswarm
attach(world) beeswarm(urb~continent,pch=16, col=rainbow(8)) # # Boxplot beeswarm combination boxplot(urb ~ continent) beeswarm(urb ~ continent, col = 2, add = TRUE)