User Guide

450
Chapter 29
Factor Analy
sis Rotation
Figure 29-6
Factor Analysis Rotation dialog box
Method. Allows you to select the method of factor rotation. Available methods are
varimax,
direct oblimin, quartimax, equamax, or promax.
 Varimax
Method.
An orthogonal rotation method that minimizes the number of
variables that have high loadings on each factor. It simplifies the interpretation of
the factors.
 Direct Oblimin Method. A method for oblique (nonorthogonal) rotation. When
delta eq
uals 0 (the default), solutions are most oblique. As delta becomes more
negative, the factors become less oblique. To override the default delta of 0, enter
a number less than or equal to 0.8.
 Quartimax Method. A rotation method that minimizes the number of factors needed
to expla
in each variable. It simplifies the interpretation of the observed variables.
 Equama
x Method.
A rotation method that is a combination of the varimax method,
which simplifies the factors, and the quartimax method, which simplifies the
variables. The number of variables that load highly on a factor and the number of
factor
s needed to explain a variable are minimized.
 Proma
x Rotation.
An oblique rotation, which allows factors to be correlated. It
can be calculated more quickly than a direct oblimin rotation, so it is useful
for large datasets.
Display. Allows you to include output on the rotated solution, as well as loading
plots f
or the first two or three factors.