analysis of variance was signifigant there are a couple of observations that are NA I would like to do a means seperation TukeyHSD or pairwise.t.test how do I deal with the NAs I will provide the data if necessary -- Let's not spend our time and resources thinking about things that are so little or so large that all they really do for us is puff us up and make us feel like gods. We are mammals, and have not exhausted the annoying little problems of being mammals. -K. Mullis