[R] simple help request

Hi all, I have data that looks like number|grouping I would like to preform stats for each grouping so 1|5 6|5 10|5 11|5 3|9 5|9 10|9 Say I would like to take the median for above, I should be returned 2 lines, one for group #5 and one for group #9 Does this make sense? I am sorry for the

Re: [R] simple help request

.df <- data.frame(a <- c(1,6,10,11,3,5,10), group <- c(5,5,5,5,9,9,9)) > tapply(my.df$a,my.df$group,median) > 5 9 > 8 5 > > See ?tapply and/or ?aggregate for more information. > > HTH, > > Jorge > > > > > On Fri, Aug 1, 2008 at 1:30 PM, Lotta R <[EMAIL P