ave and grouping
Patrick Hausmann <Patrick.Hausmann <at> uni-bremen.de> writes:
# I have a DF like this: sleep$b <- c(rep(8,10), rep(9,10)) sleep$me <- with(sleep, ave(extra, group, FUN = mean)) sleep # I would like to create a new variable # holding the b-th value of group 1 and 2. # This is not what I want, it takes always the '8' from group '1' # and not the '9' sleep$gr <- with(sleep, ave(extra, group, FUN = function(x) x[ b[1] ])) sleep
Nice example, but I don't fully understand what you want. sleep$b[1] 8 Or could it be that you got into the factor-trap? Try R-FAQ How-do-I-convert-factors-to-numeric_003f Dieter