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Modeling and Multivariate Methods - SAS

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110 Fitting St<strong>and</strong>ard Least Squares Models Chapter 3<br />

Effect Options<br />

Figure 3.44 LSMeans Plot Comparison with Transposed Factors<br />

LSMeans Contrast<br />

A contrast is a set of linear combinations of parameters that you want to jointly test to be zero. JMP builds<br />

contrasts in terms of the least squares means of the effect. By convention, each column of the contrast is<br />

normalized to have sum zero <strong>and</strong> an absolute sum equal to two. If a contrast involves a covariate, you can<br />

specify the value of the covariate at which to test the contrast.<br />

Example of the LSMeans Contrast Option<br />

To illustrate using the LSMeans Contrast option:<br />

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

2. Select Analyze > Fit Model.<br />

3. Select height <strong>and</strong> click Y.<br />

4. Select age <strong>and</strong> click Add.<br />

5. Click Run.<br />

6. From the red triangle menu next to age, select LSMeans Contrast.<br />

Figure 3.45 LSMeans Contrast Specification Window

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