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...or R? - Is there another way (a better way) to test for such differences? Thank you very much in advance for your help. [1] http://jo.irisson.free.fr/work/research_tetiaroa.html [2] http://findarticles.com/p/articles/mi_m2120/is_n1_v77/ai_18066337/pg_7 Jean-Olivier Irisson --- UMR 5244 CNRS-EPHE-UPVD, 52 av Paul Alduy, 66860 Perpignan Cedex, France +336 21 05 19 90 http://jo.irisson.free.fr/work/

Hello eveybody, I am studying the vertical distribution of plankton and want to study its variations relatively to several factors (time of day, species, water column structure etc.). So my data is special in that, at each sampling site (each observation), I don't have *one* number, I have *several* numbers (abundance of organisms in each depth bin, I sample 5 depth bins) which