Sorry if the email became messed up. I have written the full thing on
pastebin.
pastebin.com/AXvGstaR

Thanks for the suggestion. I will play test with aggregate!


*--Bitmessage <http://bitmessage.org/> me*
*BM-2D97QV3Y4VRfjayrWahqE61XKuQw6dJvj6*


On 13 February 2014 06:51, PIKAL Petr <petr.pikal@precheza.cz> wrote:

> Hi
>
> Posting in HTML results in scrambled mail.
>
> Maybe you want
>
> ?aggregate
>
> Regards
> Petr
>
> > -----Original Message-----
> > From: r-help-bounces@r-project.org [mailto:r-help-bounces@r-
> > project.org] On Behalf Of Rewarp
> > Sent: Thursday, February 13, 2014 12:55 AM
> > To: r-help@r-project.org
> > Subject: [R] Help on best way to calculate and plot overall mean from
> > dataset with two treatment groups
> >
> > I am working on a dataset which has multiple species over several
> > plots, categorised into two treatment groups.
> >
> > For example
> >
> > group_xy group_op plot species value
> > x o 1 A 3
> > x o 1 A 5
> > x o 1 B 4
> > x o 2 A 3
> > x o 2 A 6
> > x o 2 A 3
> > y o 1 A 3
> > y o 1 A 5
> > y o 1 B 4
> > y o 2 A 3
> > y o 2 A 6
> > y o 2 A 3
> > x p 1 A 3
> > x p 1 A 5
> > x p 1 B 4
> > x p 2 A 3
> > x p 2 A 6
> > x p 2 A 3
> > y p 1 A 3
> > y p 1 A 5
> > y p 1 B 4
> > y p 2 A 3
> > y p 2 A 6
> > y p 2 A 3
> >
> > What I would like to do is to take the mean of the species within each
> > plot in each treatment group, then generate the mean for the species
> > based upon the average of the values between plots.
> >
> > Thus the intermediate output would be
> >
> > group_xy group_op plot species mean_value standard_deviation x o 1 A 3
> > sd x o 1 B 4 sd x o 2 A 4 sd y o 1 A 3 sd y o 1 B 4 sd y o 2 A 4 sd x p
> > 1 A 3 sd x p 1 B 4 sd x p 2 A 4 sd y p 1 A 3 sd y p 1 B 4 sd y p 2 A 4
> > sd
> >
> > Then eventually
> > group_xy group_op species total_mean_value standard_deviation x o A 3.5
> > sd x o B 4 sd y o A 3.5 sd y o B 4 sd x p A 3.5 sd x p B 4 sd y p A 3.5
> > sd y p B 4 sd
> >
> > I am looking for an elegant code which would allow me to do this and
> > generate plots. for all species for all treatment groups.
> >
> > Any help would be appreciated!
> >
> >       [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help@r-project.org 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.
>
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