Hi A very simple question (from a R novice) How do I create a new variable within R. I have two existing variables (eg group number 1,2,3 and diagnosis 1,2,3). How would I create a new variable in which those in group1 with diagnosis 1 are assigned 'positive' and the remainder are 'negative'?? Many thanks- and sorry it's so simple! Philip [[alternative HTML version deleted]]