[R] dropping rows
p.dalgaard at biostat.ku.dk
Thu Dec 2 01:42:33 CET 2004
Tobias Muhlhofer <t.muhlhofer at lse.ac.uk> writes:
> 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.
subset(myframe, year >= 1960)
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907
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