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Basic Analysis and Graphing - SAS

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Chapter 21<br />

Creating Ternary Plots<br />

Using the Ternary Plot Platform<br />

The Ternary Plot comm<strong>and</strong> in the Graph menu produces a three-axis plot.<br />

Ternary plots are a way of displaying the distribution <strong>and</strong> variability of three-part compositional data. (For<br />

example, the proportion of s<strong>and</strong>, silt, <strong>and</strong> clay in soil or the proportion of three chemical agents in a trial<br />

drug.) You can use data expressed in proportions or use absolute measures.<br />

The ternary display is a triangle with sides scaled from 0 to 1. Each side represents one of the three<br />

components. A point is plotted so that a line drawn perpendicular from the point to each leg of the triangle<br />

intersect at the component values of the point.<br />

Figure 21.1 Examples of Ternary Plots

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