-1, regardless of the current weighting variable.
-@item FIRST(var_name)
-First value in this group.
-@item LAST(var_name)
-Last value in this group.
+1, regardless of the current weighting variable. The default format is F7.0.
+
+@item PGT(var_name, value)
+Percentage between 0 and 100 of values greater than the specified
+constant. The default format is F5.1.
+
+@item PIN(var_name, low, high)
+Percentage of values within the specified inclusive range of
+constants. The default format is F5.1.
+
+@item PLT(var_name, value)
+Percentage of values less than the specified constant. The default
+format is F5.1.
+
+@item POUT(var_name, low, high)
+Percentage of values strictly outside the specified range of
+constants. The default format is F5.1.
+
+@item SD(var_name)
+Standard deviation of the mean. Limited to numeric values. The
+default format is F8.2.
+
+@item SUM(var_name)
+Sum. Limited to numeric values. The default format is F8.2.