Data Smoothing: Polynomial Regression |
Plots Tab |
You can use the Plots tab to create plots that graphically display results of the analysis. (See Figure 20.4.) The raw residuals are computed as , where indicates the variable that contains the predicted values of the response.
Creating a plot often adds one or more variables to the data table. The following plots are available:
creates a scatter plot of the X and Y variables, overlaid with the polynomial smoother.
creates a scatter plot of the Y variable versus the predicted values.
creates a scatter plot of the residuals versus the predicted values.
creates a scatter plot of the residuals versus the X variable.
Note:SAS/IML Studio adds a smoother to an existing scatter plot when both of the following conditions are satisfied:
The scatter plot is the active window when you select the analysis.
The scatter plot variables match the analysis variables.
Chapter 18, Data Smoothing: Loess, discusses how to display multiple smoothers in a single scatter plot, and how to remove smoothers from a scatter plot.
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