>I'm trying to model spring build-up in splits to determine -- or at least
bracket -- the optimal split size and timing.

Allen, don't know if you've tried go work with it, but Lloyd Harris has
developed a spreadsheet-based program, based upon extensive data from
packages building up, and then overwintering in Manitoba.  Lloyd tells me
that it is easy to use, and with your facility with spreadsheets, you'd be
just the guy to work with it.  Let me know what you think!
http://www.umanitoba.ca/afs/entomology/LHarrisSpreedsheetLayout.xls

Randy Oliver

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