Re: [R] Calculating mean together with split

From: David Barron <mothsailor_at_googlemail.com>
Date: Wed 20 Sep 2006 - 14:03:04 GMT

Have a look at the function aggregate.table in the package gtools (part of the gregmisc bundle).

On 20/09/06, Rainer M Krug <rkrug@sun.ac.za> wrote:
> Hi
>
> I have a table called npl containing results of simulations.
>
> It contains about 19000 entries and the structure looks like this:
>
> NoPlants sim run year DensPlants
> 1 6 lng_cs99_renosterbos 1 4 0.00192
> .
> .
> .
>
>
> it has 43 different entries for sim and year goes from 1 to 100, and run
> from 1 to 5.
>
> I would like to calculate the mean of DensPlants for each simulation and
> each year seperately, i.e. calculating the mean for all combinations of
> sim and year over run.
>
> I can use
>
> split(npl, npl$sim)
>
> to split npl into different groups each containing the entries for one
> parameterset - but where to go from there?
>
> Rainer
>
> --
> Rainer M. Krug, Dipl. Phys. (Germany), MSc Conservation
> Biology (UCT)
>
> Department of Conservation Ecology and Entomology
> University of Stellenbosch
> Matieland 7602
> South Africa
>
> Tel: +27 - (0)72 808 2975 (w)
> Fax: +27 - (0)21 808 3304
> Cell: +27 - (0)83 9479 042
>
> email: RKrug@sun.ac.za
> Rainer@krugs.de
>
> ______________________________________________
> R-help@stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

-- 
=================================
David Barron
Said Business School
University of Oxford
Park End Street
Oxford OX1 1HP

______________________________________________
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Received on Thu Sep 21 00:06:50 2006

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.1.8, at Wed 20 Sep 2006 - 14:30:05 GMT.

Mailing list information is available at https://stat.ethz.ch/mailman/listinfo/r-help. Please read the posting guide before posting to the list.