[R] analyze subsample of dataframe
jholtman at gmail.com
Wed Sep 17 00:19:43 CEST 2008
x$judy[x$year == 2004] <- x$judy[x$year == 2004] - 1
On Tue, Sep 16, 2008 at 6:02 PM, T.D.Rudolph <prairie.picker at gmail.com> 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" (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 for
> a leap year (2004), I simply need to subtract 1 from every judy value for
> the year 2004 (without altering judy values from other years!). What is the
> most effective way of going about this? Can I integrally subset within a
> function of some form?
> View this message in context: http://www.nabble.com/analyze-subsample-of-dataframe-tp19520470p19520470.html
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> and provide commented, minimal, self-contained, reproducible code.
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