Thanks! That's what I need. On Tue, Dec 29, 2009 at 1:33 PM, Dimitris Rizopoulos < d.rizopou...@erasmusmc.nl> wrote:
> have a look at ?ave(), e.g., > > A <- 1:10 > B <- factor(c(1,2,2,4,4,4,7,7,7,7)) > > ave(A, B) > > > I hope it helps. > > Best, > Dimitris > > > farida...@gmail.com wrote: > >> Dear R experts, >> >> I would like to substitute the values of a vector, say A, with the average >> values taken over a factor >> >> For example, lets assume >> >> >> A >> >> [1] 1 2 3 4 5 6 7 8 9 10 >> >> B >> >> [1] 1 2 2 4 4 4 7 7 7 7 >> Levels: 1 2 4 7 >> >> I need to have >> >> 1.0 2.5 2.5 5.0 5.0 5.0 8.5 8.5 8.5 8.5 8.5 >> >> Thank you >> >> [[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. >> >> > -- > Dimitris Rizopoulos > Assistant Professor > Department of Biostatistics > Erasmus University Medical Center > > Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands > Tel: +31/(0)10/7043478 > Fax: +31/(0)10/7043014 > [[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.
