Publication date: 08/13/2020

Two-Factor Response Surface Model

Effects to be entered: X&RS, Z&RS, X*X, X*Z, Z*Z

1. In the Select Columns list, select two continuous effects, X and Z.

2. Select Macros > Response Surface.

Example of Two-Factor Response Surface Model

In the Odor Control sample data table, you want to fit a response surface to model the response, odor, as a function of temp and gl ratio. (Although you could include ht, as shown in the data table script Response Surface, for this illustration do not.)

1. Select Help > Sample Data Library and open Odor Control

2. Select Analyze > Fit Model.

3. In the Select Columns list, select odor and click Y.

4. In the Select Columns list, select temp and gl ratio.

5. Select Macros > Response Surface.

Figure 2.20 Fit Model Window for Two-Factor Response Surface ModelĀ 

6. Click Run.

Figure 2.21 shows a Surface Profiler plot of the data and a quadratic response surface fit to the data for the Odor Control sample data table. To obtain this plot, click the Response odor red triangle and select Factor Profiling > Surface Profiler. To show the points, click the disclosure icon to open the Appearance panel and click Actual. If you want to make the points appear larger, right-click in the plot, select Settings and adjust the Marker Size.

Figure 2.21 Model Fit for a Degree-Two Polynomial in Two VariablesĀ 

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