[R] dropping rows

[Thomas Lumley]

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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>>
>
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Thomas Lumley			Assoc. Professor, Biostatistics
tlumley at u.washington.edu	University of Washington, Seattle