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Basic Analysis and Graphing - SAS

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348 Creating Overlay Plots Chapter 12<br />

Additional Examples of the Overlay Plot Platform<br />

Figure 12.9 Dual Axis Overlay Plot<br />

The variables High, Low, <strong>and</strong> Close are the stock prices of the same stock <strong>and</strong> thus are on the same scale.<br />

Volume is a different scale entirely, representing the trading volume of the entire Dow Jones Industrial<br />

Average.<br />

To see why this matters, perform the same steps above without clicking the Left Scale/Right Scale button<br />

for Volume. Compare the resulting graph in Figure 12.10 to Figure 12.9.<br />

Figure 12.10 Single Axis Overlay Plot<br />

Grouping Variables<br />

The Overlay Plot platform allows the production of several plots in one window through the use of<br />

grouping variables. With one grouping variable, a stacked vector of plots appears, with one plot for each<br />

level of the grouping variable. Two grouping variables result in a matrix of plots.<br />

1. Open the students.jmp sample data table.<br />

2. From the Graph menu, select Overlay Plot.

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