Modeling and Multivariate Methods - SAS

102 Fitting Standard Least Squares Models Chapter 3
Row Diagnostics
Figure 3.38 Illustration of a General Leverage Plot
residual
residual constrained
by hypothesis
points farther out pull on the
line of fit with greater leverage
than the points near the middle
The leverage plot for the linear effect in a simple regression is the same as the traditional plot of actual
response values and the regressor.
Example of a Leverage Plot for a Linear Effect
1. Open the Big Class.jmp sample data table.
2. Select Analyze > Fit Model.
3. Select weight and click Y.
4. Select height and click Add.
5. Click Run.
Figure 3.39 Whole Model and Effect Leverage Plots
The plot on the left is the Whole Model test for all effects, and the plot on the right is the leverage plot for
the effect height.