sorry, that should be
tapply(x2, x1, mean)
Best,
Dimitris
Dimitris Rizopoulos wrote:
have a look at ?tapply(), e.g.,
x1 <- c(rep(1,6),rep(4,7),rep(6,10))
x2 <- rnorm(length(x1),6,1)
tapply(x1, x1, mean)
I hope it helps.
Best,
Dimitris
amor Gandhi wrote:
Hi,
I have gote the following data
x1 <- c(rep(1,6),rep(4,7),rep(6,10))
x2 <- rnorm(length(x1),6,1)
data <- data.frame(x1,x2)
and I would like to compute the mean of the x2 for each individual of
x1, i. e. x1=1,4 and 6?
Thank you very much in advance,
Amori
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Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus University Medical Center
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