+@subsubheading Effect on Summary Statistics
+
+@code{CLABELS} primarily affects the appearance of tables, not the
+data displayed in them. However, @code{CTABLES} can affect the values
+displayed for statistics that summarize areas of a table, since it can
+change the definitions of these areas.
+
+For example, consider the following syntax and output:
+
+@example
+CTABLES /TABLE AgeGroup BY qns3a [ROWPCT, COLPCT].
+@end example
+@psppoutput {ctables23}
+
+@noindent
+Using @code{COLLABELS=OPPOSITE} changes the definitions of rows and
+columns, so that column percentages display what were previously row
+percentages and the new row percentages become meaningless (because
+there is only one cell per row):
+
+@example
+CTABLES
+ /TABLE AgeGroup BY qns3a [ROWPCT, COLPCT]
+ /CLABELS COLLABELS=OPPOSITE.
+@end example
+@psppoutput {ctables24}
+
+@subsubheading Moving Categories for Stacked Variables
+
+If @code{CLABELS} moves category labels from an axis with stacked
+variables, the variables that are moved must have the same category
+specifications (@pxref{CTABLES Per-Variable Category Options}) and the
+same value labels.
+
+The following shows both moving stacked category variables and
+adapting to the changing definitions of rows and columns:
+
+@example
+CTABLES /TABLE (qn105ba + qn105bb) [COLPCT].
+CTABLES /TABLE (qn105ba + qn105bb) [ROWPCT]
+ /CLABELS ROW=OPPOSITE.
+@end example
+@psppoutput {ctables25}
+