[R] Calculating mean together with split
mothsailor at googlemail.com
Wed Sep 20 16:10:28 CEST 2006
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
On 20/09/06, David Barron <mothsailor at 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 at 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 at sun.ac.za
> > Rainer at krugs.de
> > ______________________________________________
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> > and provide commented, minimal, self-contained, reproducible code.
> David Barron
> Said Business School
> University of Oxford
> Park End Street
> Oxford OX1 1HP
Said Business School
University of Oxford
Park End Street
Oxford OX1 1HP
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