Re: [R] analyze subsample of dataframe

x$judy[x$year == 2004] <- x$judy[x$year == 2004] - 1 On Tue, Sep 16, 2008 at 6:02 PM, T.D.Rudolph <[EMAIL PROTECTED]> wrote: > > Hi there, > > I'm dealing with a pretty big dataset (~22,000 entries) with numerous > entries for every day over a period of several years. I have a column > "judy" (fo

[R] analyze subsample of dataframe

Hi there, I'm dealing with a pretty big dataset (~22,000 entries) with numerous entries for every day over a period of several years. I have a column "judy" (for Julian Day) with 0 beginning on Jan. 1st of every new year (I want to compare tendencies between years). However, in order to control