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Basic Analysis and Graphing - SAS

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452 Creating Parallel Plots Chapter 17<br />

The Parallel Plot<br />

Interpreting Parallel Plots<br />

To help you interpret parallel plots, compare the parallel plot with a scatterplot. In each of the following<br />

figures, the parallel plot appears on the left, <strong>and</strong> the scatterplot appears on the right.<br />

Strong Positive Correlation<br />

The following relationship shows a strong positive correlation. Notice the coherence of the lines in the<br />

parallel plot.<br />

Figure 17.6 Strong Positive Correlation<br />

Strong Negative Correlation<br />

A strong negative correlation, by contrast, shows a narrow neck in the parallel plot.<br />

Figure 17.7 Strong Negative Correlation<br />

[<br />

Collinear Groups<br />

Now, consider a case that encompasses both situations: two groups, both strongly collinear. One has a<br />

positive slope, the other has a negative slope. In Figure 17.8, the positively sloped group is highlighted.

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