Modeling and Multivariate Methods - SAS

Chapter 2 Introduction to the Fit Model Platform 41
Construct Model Effects
Macros
Explanation of Nested Effects
As an illustration of what the Nest button does, consider two schools with three teachers in each. School A
has the following teachers: Sandy, Greg, and Richard. School B has the following teachers: Brad, Amy, and
Sheila. Because the teachers in School A are not the same as the teachers in School B, the teacher effect is
nested in the school effect.
Commands that are launched from the Macros button automatically generate the effects for commonly
used models.
Table 2.3 Descriptions of the Macros Options
Full Factorial
Factorial to Degree
Factorial Sorted
Response Surface
Mixture Response
Surface
Polynomial to Degree
Creates all main effects and interactions for the selected columns.
Creates all main effects and interactions to a specified degree. Specify the
degree in the Degree box.
Creates the same set of effects as the Full Factorial option but lists them in
order of degree. All main effects are listed first, followed by all two-way
interactions, then all three-way interactions, and so on.
Creates main effects, two-way interactions, and quadratic terms. Main effects
have the response surface attribute, which generates reports that are specific
to response surface models.
In a response surface model, the object is to find the values of the terms that
produce a maximum or minimum expected response. This is done by fitting
a collection of terms in a quadratic model. The critical values for the surface
are calculated from the parameter estimates and presented with a report on
the shape of the surface. See “Response Surface Curvature” on page 42.
See also Response Surface Effect in “Attributes” on page 45.
Creates main effects and two-way interactions. Main effects have the
response surface and mixture attributes, which generates reports that are
specific to mixture models.
See the Design of Experiments book. See also Mixture Effect in “Attributes”
on page 45.
Creates main effects and polynomial terms to a specified degree. Specify the
degree in the Degree box.