Hello,
Like Ivan said, you should give us a data example, the best way is to do
it is to paste the output of ?dput in a post. If your data frame is
named 'dat' use the following.
dput(head(dat, 50)) # paste the output of this in a post
As for the question, here is an example using ?aggregate, with fake data.
dat <- data.frame(X = rnorm(100), A = sample(8, 100, TRUE))
aggregate(X ~ A, data = dat, FUN = mean)
Hope this helps,
Rui Barradas
Em 03-06-2013 10:15, Laura Thomas escreveu:
Hi All,
Sorry about this quite basic, but I am very new to R.
I have a data file which has a dependent variable (reaction time) and a couple
of independent variables, one of which is coded 1-8; I want to calculate the
reaction time for each of the 8 codes of the independent variable.
Thanks for any help,
Laura
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