[R] analyze subsample of dataframe
prairie.picker at gmail.com
Wed Sep 17 00:02:09 CEST 2008
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?
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