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Dr Baird,

It depends if your units of analysis are persons or organizations.
If persons, then treat each separately.

If organizations, as I suspect, then you can make a combined frequency of 
contact metric for each organization, by adding all together.

  Barry Wellman

   S.D. Clark Professor of Sociology, FRSC               NetLab Director
   Department of Sociology                  725 Spadina Avenue, Room 388
   University of Toronto   Toronto Canada M5S 2J4   twitter:barrywellman             fax:+1-416-978-3963
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