ment</I>
must be
completely specified  before the coefficients   are input. This allows
for some checking of the input data.

<P>
If the groups/rows are specified first,  there is no  requirement that
variables/columns are input one at a time (but of course they may be).
When   processing  the  data   file, variable/column  names  should be
inspected to see if they  are new or  where they have appeared before.
Likewise,  if the variables/columns are specified  first,  there is no
requirement that groups/row