On Wed, 1 Dec 2004, Liaw, Andy wrote:
See ?subset, especially the example there.
(I'm surprised this function isn't in R-intro...)
Much of R-intro was written as an introduction to S before R existed and later translated, so there are quite a few things that aren't in it but would be in a guide written from scratch.
-thomas
Andy
From: Tobias Muhlhofer
Hi!
Sorry for asking a trivial questions, but I can't seem to figure this out.
I have a dataframe called master containing 30-odd variables.
In this dataframe, I have observations across these 30 variables from 1930 to 2003 (I've made a "year" variable). How can I drop all rows for which the year is less than 1960? I'm assuming something with ifelse() but I can't quite figure it out.
I would appreciate a suggestion of some syntax.
Thanks! Toby
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Thomas Lumley Assoc. Professor, Biostatistics [EMAIL PROTECTED] University of Washington, Seattle
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