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Modeling and Multivariate Methods - SAS

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306 Fitting Dispersion Effects with the Loglinear Variance Model Chapter 12<br />

Example Using Loglinear Variance<br />

Example Using Loglinear Variance<br />

The data table InjectionMolding.jmp contains the experimental results from a 7-factor 2 7-3 fractional<br />

factorial design with four added centerpoints [from Myers <strong>and</strong> Montgomery, 1995, page 519, originally<br />

Montgomery, 1991]. Preliminary investigation determined that the mean response only seemed to vary with<br />

the first two factors, Mold Temperature, <strong>and</strong> Screw Speed, <strong>and</strong> the variance seemed to be affected by<br />

Holding Time.<br />

Figure 12.1 Injection Molding Data<br />

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

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

Since the variables in the data table have preselected roles assigned to them, the launch window is<br />

already filled out.

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