Modeling and Multivariate Methods - SAS

140 Fitting Stepwise Regression Models Chapter 4
The Stepwise Report
Table 4.3 Description of the Stepwise Regression Control Panel (Continued)
Rules
Note: Appears only if your model contains related terms.
Change the rules that are applied when there is a hierarchy of terms in the
model. Select one of the following options:
Combine groups a term with its precedent terms and calculates the group’s
significance probability for entry as a joint F test. Combine is the default
rule.
Restrict restricts the terms that have precedents so that they cannot be
entered until their precedents are entered.
No Rules gives the selection routine complete freedom to choose terms,
regardless of whether the routine breaks a hierarchy or not.
Whole Effects enters only whole effects, when all terms involving that
effect are significant. This rule applies only when categorical variables
with more than two levels are entered as possible model effects.
Go
Stop
Step
Arrow buttons
Automates the selection process to completion.
Stops the selection process.
Increments the selection process one step at a time.
Step forward and backward one step in the selection process.
Enter All
Remove All
Make Model
Run Model
Enters all unlocked terms into the model.
Removes all terms from the model.
Creates a model for the Fit Model window from the model currently
showing in the Current Estimates table. In cases where there are nominal or
ordinal terms, Make Model can create new data table columns to contain
terms that are needed for the model.
Runs the model currently showing in the Current Estimates table.
Table 4.4 describes the statistics for the current model, which appear below the Stepwise Regression Control
panel.
Table 4.4 Description of Current Model Statistics
SSE
DFE
RMSE
Sum of squares for the current model.
Degrees of freedom for the current model.
Root mean square error (residual) for the current model.