Using R and RStudio for Data Management, Statistical Analysis, and Graphics, 2nd Edition

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“K23166” — 2015/1/28 — 9:35 — page 128 — #154

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128 CHAPTER 8. A GRAPHICAL COMPENDIUM

Note: To create a figure with a single y axis value, it is straightforward to repeatedly call

points() or other functions to add elements.

In the second example, two functions addsecondy() and plottwoy() are defined to add

points on a new scale and an appropriate axis on the right. This involves rescaling and

labeling the second axis (side=4) with 6 tick marks, as well as rescaling the y2 variable.

8.3.3 Scatterplot with binning

When there are many observations, scatterplots can become difficult to read because many

plot symbols will obscure one another. One solution ...