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...and not only multiple p for different time intervals. I also think I should choose a test in which time is meaningful since the measures are not simple repeated measurements but measurements taken at specific time points. 1 million dollar question.... how to do in R? thanks in advance Dr Matteo Vidali Dep. of Medical Sciences University of East Piedmont "A. Avogadro" ITALY --

I need some help for a curious question of a friend of mine. She usually does some experiments (3-5 repeats for each exp) and then she calculates mean and standard deviation. In microsoft excel she writes something like the following sample mean sd a 1.25 0.35 b 2.65 0.65 c 3.45 0.50 She can do a vertical barplot graph just giving mean value and specifying the