Creating a grouping variable for data sets
------------------------------------------
by Marc Jacobs, Univ of Utrecht, The Netherlands, FAX: (011)31-30-534405


^bv^ and ^bvs^  create vectors that run from 1 to k, n times.
Programs like GLIM (Generalized Linear Interactive Modelling) or ML3 
(Multilevel analysis) make use of those vectors.


^bv.ado^, creates a vector, with total length _N, consisting 
of blocks running from 1 to k, as many times as is possible. 

^bvs.ado^, constructs a vector, length _N, consisting of blocks 
of 1, 2, ... n.

Results would be like this:

   ^. BV n 5^       ^. BVS s 5^

        n               s
        1               1
        2               1
        3               1
        4               1
        5               1
        1               2
        2               2
        3               2
        4               2
        5               2
        .               .
        .               .
        n               n