Carlos Ortega wrote:>
> Hello,
>
> Although your message is not very explicit about the structure of your data
> frame,
> I think you can get what you want by using a combination of the function
> "split" and
> the "apply" functions family: apply, lapply and sapply.
>
> If you provide a more detailed organization of your data frame, perhaps we
> can give
> to you a more wiser advice.
aggregate() is your friend.
-d
>
> Thanks,
> Carlos.
> P.S: By the way, please include in the "Subject" a more
descriptive message.
>
> -----Mensaje original-----
> De: owner-r-help at stat.math.ethz.ch
> [mailto:owner-r-help at stat.math.ethz.ch]En nombre de Erin Hodgess
> Enviado el: mi?rcoles, 23 de enero de 2002 22:39
> Para: r-help at stat.math.ethz.ch
> Asunto:
>
> Dear R People:
>
> Here is a very simple question, please:
>
> I have a data frame with the state name, state division, and population.
>
> Note: state division is something like Atlantic, Mountain, etc.
>
> I want to produce a table with the state division and the total of the
> populations for the states within that division.
>
> I've been messing with "table" but so far, no luck.
>
> This is R1.3.1, on Windows 98.
>
> thanks in advance!
>
> Sincerely,
> Erin Hodgess
> Associate Professor
> Department of Computer and Mathematical Sciences
> University of Houston - Downtown
> 1 Main Street
> Houston, TX 77002
> mailto: hodgess at uhddx01.dt.uh.edu
>
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