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/PCOMPUTE &postcompute=EXPR(expression)
/PPROPERTIES &postcompute…
    [LABEL=string]
    [FORMAT=[summary format]…]
    [HIDESOURCECATS={NO | YES}
Computed categories, also called postcomputes, are
categories created using arithmetic on categories obtained from the
data.  The PCOMPUTE subcommand creates a postcompute, which may
then be used on CATEGORIES within an explicit category list
(see CTABLES Explicit Category List).  Optionally,
PPROPERTIES refines how a postcompute is displayed.  The
following sections provide the details.