Categorical Principal Components Analysis Category Plots

The Category Plots dialog box allows you to specify the types of plots you want and the variables for which plots will be produced.

Category Plots. For each variable selected, a plot of the centroid and vector coordinates is plotted. For variables with multiple nominal scaling levels, categories are in the centroids of the objects in the particular categories. For all other scaling levels, categories are on a vector through the origin.

Joint Category Plots. This is a single plot of the centroid and vector coordinates of each selected variable.

Transformation Plots. Displays a plot of the optimal category quantifications versus the category indicators. You can specify the number of dimensions for variables with multiple nominal scaling levels; one plot will be generated for each dimension. You can also choose to display residual plots for each variable selected.

Project Centroids Of. You may choose a variable and project its centroids onto selected variables. Variables with multiple nominal scaling levels cannot be selected to project on. When this plot is requested, a table with the coordinates of the projected centroids is also displayed.

To Obtain Category Plots in CATPCA

1. Select the dependent and independent variables in the Categorical Principal Components dialog box.
2. In the Plots group, click Category.
3. Select the types of plots and variables for which plots will be produced.
4. Click Continue.