[R] Mean according to the combination of two factors
ruipbarradas at sapo.pt
Sat Jan 12 00:56:35 CET 2013
Try the following.
# make up some data
dat <- data.frame(values = rnorm(100), experiment = sample(10, 100,
TRUE), composite = sample(17, 100, TRUE))
aggregate(values ~ experiment + composite, data = dat, FUN = mean)
Hope this helps,
Em 11-01-2013 23:26, li li escreveu:
> Dear all,
> I have a data frame where there are three variables: values, experiment,
> Values are numerical values. There are 10 levels for the experiment. Within
> each level of experiment,
> there are 17 levels of composite.
> I want to find mean for each combination of levels of the experiment and
> the levels of composite.
> Can anyone give some help here.
> Thank you, Hanna
> [[alternative HTML version deleted]]
> R-help at r-project.org mailing list
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
More information about the R-help