st: Contract/Collapse Combination Continued

[Lucas <lucaselastic@gmail.com>]

Perhaps I should clarify.  My data is like this

X1   X2   X3  . . .   X14   X15   ENTERCOLL
 25  13     0   . . .     11       3                     1
 33    2     1   . . .     27     -8                      1
 22  11     1   . . .     15       3                     0

and so on for millions of lines of individual level data.  The
challenge is to turn this into where Brandon started, and do so
without ending up with mis-matches.  Mis-matches are easy because
several variables are multi-integer valued, and not all combinations
will have non-zero counts of cases in every condition (ENTERCOLL=0
*and* ENTERCOLL=0).

So, my question was trying to see if one could contract/collapse the
individual-level data to make it look like Brendan's data, and do so
such that one line contained counts of both the ENTERCOLL=0 and
ENTERCOLL=1 cases.

I hope this clarifies.  Thanks a bunch for your note and for any
additional assistance.

Sam
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