Re: [R] Calculating mean together with split

From: David Barron <mothsailor_at_googlemail.com>
Date: Wed 20 Sep 2006 - 14:10:28 GMT

Of course, aggregate will work too, depends on how you want the output to be formatted. You could also look at summarize in the Hmisc package.

On 20/09/06, David Barron <mothsailor@googlemail.com> wrote:
> Sorry, that should have been package gdata, not gtools...they're both
> in the same bundle, though.
>
> 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
>

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

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Received on Thu Sep 21 00:14:40 2006

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