[R] using ddply but preserving some of the outside data

jebyrnes byrnes at msi.ucsb.edu
Wed Aug 5 22:11:13 CEST 2009

Interesting.  While this will work for a single site, however, for multiple
sites or other grouping variables, I'm left with the same problem of
efficiently going from one data from to the other.

David Winsemius wrote:
> library(zoo)
> ?rollmean
> David Winsemius, MD
> Heritage Laboratories
> West Hartford, CT
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