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
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--
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
______________________________________________
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.
