Hi all,
How can I have a dynamic list for different combinations of grouping factors in
the following example? Thanks.
dat <- data.frame(x=rnorm(100),
a=sample(letters[1:5], replace = T),
b=sample(letters[1:5], replace = T),
c=sample(letters[1:5], replace = T),
d=sample(letters[1:5], replace = T))
## define grouping factors
grp <- c('a','d') # or any combination among a, b, c and d
## something like this for the list
lst <- paste('dat$', grp, sep='', collapse =',')
## aggregate on the defined list
aggregate(dat$x, list(lst), mean)
Thanks.
Regards,
Xianming
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