Help System (web edition)

The grouping variables are given by the GROUPING (CLASS) parameter:
         GROUPING=<gr.vble1>,<gr.vble2>, ...
For each grouping variable the grouping structure may be given in the
form
         <gr.vble>=value1(label1),value2(label2), ...
The labels given in parenthesis are optional. If the grouping values
are given in ascending order then they are considered as cutpoints
for forming groups, e.g.
          KNOWLDGE=20,50,80,110,140
Values greater than the last cutpoint are treated as missing values.
The list above could be shortened by the notation 20(30)140.

You can use string variables as grouping variables. The grouping
structure of a string variable is given in the form
          <gr.vble>=symbol1,symbol2, ...
The first 32 characters of a string variable are significant.

If the grouping structure of a grouping variable is not given then
the all existing values of that variable are used.

Theoretically at most 8 grouping variables may be given. The maximum
number of groups for each grouping variable is 32 (can be altered by
the parameter setting MAXNCL=<new limit>). The space requirement
is appr. proportional to the product of the number of groups.
Nested grouping variables 

In some situations one wants to use grouping variables that are
nested. The nesting is indicated by brackets, e.g.
   GROUPING=City[State]
By using the notation a lot of empty lines or columns in the output
table are avoided, because each city may belong only to one state.
There may be several steps in the nesting hierarchy (at most 6
grouping variables):
   GROUPING=Subcity[City[State]]
At this moment the grouping structure of nested grouping variables
cannot be given. The program will search the existing combinations
of values of nesting variables and uses all combinations found.

The default maximum for the number of combinations of values is
64, which may be altered by MAXNEST=<new value>.

  M = More information on the MTAB operation