SPSS Categories® 11.0

14 Chapter 1
Displays with More than Two Dimensions
All of the optimal scaling procedures involving dimension reduction allow you to select
the number of dimensions included in the analysis. For analyses with three or more dimensions,
these procedures produce three-dimensional scatterplots or matrices of scatterplots.
Three-Dimensional Scatterplots
Figure 1.2 shows a three-dimensional plot of object scores produced by a homogeneity
analysis with four dimensions.
Figure 1.2 Three-dimensional plot of object scores
Although only the first three dimensions are displayed on the scatterplot, information
about all dimensions is included when the chart is created. You can choose to display
different combinations of dimensions on the scatterplot by selecting Displayed from the
Series menu in the Chart Editor. Figure 1.3 shows the 3-D Scatterplot Displayed Data
dialog box, with dimension 4 selected to be displayed in place of dimension 3. The plot
displaying these selections is shown in Figure 1.4.