A data set(dat),has 2 variables: x and a, and 100 rows. I wanna add 2 variables,and call the new data set dat1: var1:f = a/median(a) var2:x_new = x*f My solution: dat1<-transform(dat,f = a/median(a),x_new = x*f) But gets error reply which says that "f" is not exits since dat has no variables called "f". So I have to do through 2 steps: dat0<-transform(dat,f=a/median(a)) dat1<-transform(dat0,x_new=x*f) How to do it through 1 step? Many thanks! [[alternative HTML version deleted]]
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