st: create a contingency table

[Jean-Benoit Hardouin <jean-benoit.hardouin@club-internet.fr>]

dear statalisters,
I search a method to transform a data as :
Item1 Item2 Item3 Item4 0 0 1 2 1 3 0 1
3 0 2 1

(table of the responses of individuals to four items) in
Item1 Item2 Item3 Item4 Count
0 0 0 0 125
0 0 0 1 88
0 0 0 2 72
0 0 0 3 52
0 0 1 0 28
0 0 1 1 65
0 0 1 2 42
...

where 125 is the number of individuals who have respond 0 to each item, 88 
is the number of individuals who have respond 0 to the first three item and 
1 to the last item, etc.

I don't find how to obtain this kind of table with "reshape" or "egen" (for 
example).

I have idea to program that with four "forvalues..." but perhaps it exist a 
specific command.

Thank you for your help

Jean-Benoit Hardouin,
Regional Health Observatory, Orléans, France 
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