Dear all, I measured the survival and biomass of plants under various combinations of treatments. There are three treatments (S, T, N) with two levels each (S, s; T, t; N, n). The 8 possible combinations STN STn StN Stn sTN sTn stN stn are organized in a split-split plot design and replicated 12 times. I have analyzed the survival data (%) using the aov function, which seemed to work fine. I then tried to analyze the biomass data, but since many plants died, there is quite a bit of missing data. The aov function does not seem to allow the analyses of such data. Can anybody help? Yours sincerely, Elise Buisson.