Modeling and Multivariate Methods - SAS

448 Correlations and Multivariate Techniques Chapter 17
Multivariate Platform Options
Color Map
The Color Map menu contains three types of color maps.
Color Map On Correlations Produces a cell plot that shows the
correlations among variables on a scale from red (+1) to blue
(-1).
Color Map On p-values Produces a cell plot that shows the
significance of the correlations on a scale from p = 0 (red) to p = 1
(blue).
Cluster the Correlations Produces a cell plot that clusters
together similar variables. The correlations are the same as for
Color Map on Correlations, but the positioning of the variables
may be different.
These options are off by default.
Parallel Coord Plot
Ellipsoid 3D Plot
Principal Components
Outlier Analysis
Item Reliability
Shows or hides a parallel coordinate plot of the variables. This
option is off by default.
Shows or hides a 95% confidence ellipsoid around three variables
that you are asked to specify the three variables. This option is off by
default.
This menu contains options to show or hide a principal components
report. You can select correlations, covariances, or unscaled.
Selecting one of these options when another of the reports is shown
changes the report to the new option. Select None to remove the
report. This option is off by default.
Principal components is a technique to take linear combinations of
the original variables. The first principal component has maximum
variation, the second principal component has the next most
variation, subject to being orthogonal to the first, and so on. For
details, see the chapter “Analyzing Principal Components and
Reducing Dimensionality” on page 481.
This menu contains options that show or hide plots that measure
distance in the multivariate sense using one of these methods: the
Mahalanobis distance, jackknife distances, and the T 2 statistic.
For details, see “Outlier Analysis” on page 451.
This menu contains options that each shows or hides an item
reliability report. The reports indicate how consistently a set of
instruments measures an overall response, using either Cronbach’s α
or standardized α. These options are off by default.
For details, see “Item Reliability” on page 453.