On Jul 19, 2011, at 11:58 AM, William Dunlap wrote:
-Original Message-
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org
] On Behalf Of Daniel Malter
Sent: Tuesday, July 19, 2011 1:51 AM
To: r-help@r-project.org
Subject: Re: [R] Centering data frame by factor
> -Original Message-
> From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
> Behalf Of Daniel Malter
> Sent: Tuesday, July 19, 2011 1:51 AM
> To: r-help@r-project.org
> Subject: Re: [R] Centering data frame by factor
>
>
> P
On Jul 19, 2011, at 4:50 AM, Daniel Malter wrote:
P1-tapply(P1,Experiment,mean)[Experiment]
Another way would be with ave(), but I discovered that it does not
accept subsidiary arguments and does not issue warnings either, so
this works:
> with(dfrm, ave(P1, Experiment, FUN=function(x
Perfect! Made my day!
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Hi,
I would like to center P1 and P2 of the following data frame by the factor
"Experiment", i.e. substruct from each value the average of its experiment,
and keep the original data structure, i.e. the experiment and the group of
each value.
RAW=
data.frame("Experiment"=c(2,2,2,1,1,1),"Group"=c(
P1-tapply(P1,Experiment,mean)[Experiment]
HTH,
Daniel
ronny wrote:
>
> Hi,
>
> I would like to center P1 and P2 of the following data frame by the factor
> "Experiment", i.e. substruct from each value the average of its
> experiment, and keep the original data structure, i.e. the experiment a
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