[R] extracting data from a dataframe

Thomas Lumley tlumley at u.washington.edu
Fri Aug 2 17:37:10 CEST 2002

On Fri, 2 Aug 2002, Tim Wilson wrote:

> Hi everyone,
> Here's a question about extracting data from a dataframe:
> Let's say I've got a dataframe with two vectors, TEST and GENDER. GENDER
> contains a 1 for males and 2 for females. I want to separate the results
> of TEST by GENDER so I can compare their means.
> What's the most efficient way to do this with R?

No guarantees of efficiency, but the easiest is


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