Scatterplots in Base R

Adding Noise (jitter)

In the previous example a little bit of "noise" was added to the pairs to produce an artificial offset. This is a common thing to do for making plots. A simpler way to accomplish this is to use the jitter command.

> numberWhite <- rhyper(400,4,5,3)
> numberChipped <- rhyper(400,2,7,3)
> par(mfrow=c(1,2))
> plot(numberWhite,numberChipped,xlab="Number White Marbles Drawn",
       ylab="Number Chipped Marbles Drawn",main="Pulling Marbles")
> plot(jitter(numberWhite),jitter(numberChipped),xlab="Number White Marbles Drawn",
       ylab="Number Chipped Marbles Drawn",main="Pulling Marbles With Jitter")

Figure 3. Points with noise added using the jitter command.