SPSS Categories® 11.0

16 Chapter 1
Figure 1.5 Scatterplot matrix displaying object scores for four dimensions
In contrast to the other dimension reduction techniques, correspondence analysis produces
a matrix of scatterplots similar to Figure 1.5 for all analyses. If you desire individual
two- or three-dimensional scatterplots, use the Scatter option on the Gallery menu in
the Chart Editor. Alternatively, to omit or add dimensions to an existing scatterplot matrix,
use the Displayed command on the Series menu (see the SPSS Base User’s Guide
for information on editing charts and using the chart gallery).
Aspect Ratio in Optimal Scaling Charts
Aspect ratio in optimal scaling plots is isotropic. In a two-dimensional plot, the distance
representing one unit in dimension 1 is equal to the distance representing one unit in dimension
2. If you change the range of a dimension in a two-dimensional plot, the system
changes the size of the other dimension to keep the physical distances equal. Isotropic
aspect ratio cannot be overridden for the optimal scaling procedures.