subsetting data frame using by() or tapply() or other

Thu, Oct 13, 2005 3:54 PM

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Brian S Cade subsetting data frame using by() or tapply() or other Oct 13 Marc Schwartz (via MN) subsetting data frame using by() or tapply() or other Oct 13 Brian S Cade subsetting data frame using by() or tapply() or other Oct 13