[R] dropping rows

Tobias Muhlhofer t.muhlhofer at lse.ac.uk
Thu Dec 2 01:31:03 CET 2004


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.


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