Analysis of an Experiment with Two- and Three-Level Factors - Prediction and Profiling Tab
Designs for Factors at 2 and 3 Levels
Select the Prediction & profiling tab of the Analysis of an Experiment with Two- and Three-Level Factors dialog to access options to generate plots for the fitted response surface and predicted values as well as to perform response desirability profiling. Note that these results are for the currently specified model. You can specify a new model on the Model tab.
Surface plot (fitted response). Click the Surface plot (fitted response) button to plot the currently fitted model in a surface plot, along with the observed points in the experiment. If there are more than two factors in the current design, the Select factors for 3D plot dialog is displayed when you click the Surface plot (fitted response) button. From this dialog, select the two variables for the plot.
When there are more than two factors in the current experiment and/or there are block effects included in the current model, the Select factor values dialog also is displayed, in which you specify the values for those additional factors, for which to compute the surface plot (i.e., for which to compute the fitted values). Remember that the block effects are computed from added (to the design) coded variables. The coding for those effects is described in the description of Main Effects and Interactions.
If the Show fitted function check box is selected (see below), the plot will also contain, as custom text, the currently fitted function (model). Note that the parameters shown in this function pertain to the regression coefficients, that is, to the factor settings in their original metric (see also options Summary: Effect estimates and Regression coefficients on the ANOVA/Effects tab for additional details). Thus, this surface will always show the predicted values for the dependent variable, given the original factor settings.
When there are more than two factors in the current experiment and/or there are block effects included in the current model, the Select factor values dialog also is displayed, in which you specify the values for those additional factors, for which to compute the surface plot (i.e., for which to compute the fitted values). Remember that the block effects are computed from added (to the design) coded variables. The coding for those effects is described in the description of Main Effects and Interactions.
If the Show fitted function check box is selected (see below), the plot will also contain, as custom text, the currently fitted function (model). Note that the parameters shown in this function pertain to the regression coefficients, that is, to the factor settings in their original metric (see also options Summary: Effect estimates and Regression coefficients on the ANOVA/Effects tab for additional details). Thus, this surface will always show the predicted values for the dependent variable, given the original factor settings.