do you mean something like this:
tapply(x, g, function (y) {
sapply(1:length(y), function (i) mean(y[-i]))
})
I hope it helps.
Best,
Dimitris
----
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven
Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://med.kuleuven.be/biostat/
http://www.student.kuleuven.be/~m0390867/dimitris.htm
----- Original Message -----
From: "Casey Klofstad" <[EMAIL PROTECTED]>
To: <r-help@r-project.org>
Sent: Tuesday, November 13, 2007 4:45 PM
Subject: [R] group mean, minus each row's value
>I used the following to assign each row the group average, where w is
> the new group average variable, x is the variabale to be averaged,
> and
> g is the nominal group indicator:
>
> w <- ave(x,g)
>
> Now I want to calculate the group average, but WITHOUT each row's
> value of x. Is there an easy way to do this? I'm sure I'm missing
> something obvious here, but for the life of me I can't figure it
> out.
>
> Thanks!
> --
> Casey A. Klofstad
> University of Miami
> Department of Political Science
> Coral Gables, FL
>
> [EMAIL PROTECTED]
> http://moya.bus.miami.edu/~cklofstad
>
> ______________________________________________
> R-help@r-project.org mailing list
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> 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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