+The COMPARE subcommand is only relevant if producing boxplots, and it is only
+useful there is more than one dependent variable and at least one factor. If
+/COMPARE=GROUPS is specified, then one plot per dependent variable is produced,
+containing boxplots for all the factors.
+If /COMPARE=VARIABLES is specified, then one plot per factor is produced, each
+each containing one boxplot per dependent variable.
+If the /COMPARE subcommand is ommitted, then PSPP uses the default value of
+/COMPARE=GROUPS.
+