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...ov (model) to get the analysis of variance, but i know that my treatment could be organized in groups, so i would like to test these groups. Example: I have 4 treatments t1, t2, t3, t4 and i would like to test (1, 1, -1, -1) and (1, -1, 0, 0) and (0, 0, 1, -1). thanks for the attention. Rodrigo Gazaffi

...me"... like here, my model would be with no variable. I know that example, looks like silly but a have bigger data, that this happens in thirtieth iteration, what's why i would like some help i used the step(), is there other function that could stop this besides step()? cheers, Rodrigo Gazaffi x1 <- c( 0.3718, 0.3718, 0.3718, 0.3718, 0.3718, 0.3718, 0.3718, 0.3718, -1.0000, 0.3718, 0.3718, 0.3718, 0.3718, 0.3718, 0.3718, 0.3718, 0.3718, 0.3718, 0.3718, 0.3718, 0.3718, 0.3718, 0.0713, 0.1774, 0.3570, 0.3718, 0.3718, 0.3718, -1.0000, 0.3718, -1.0000, 0.1774,...

...lp me) Therefore, i need to find the best exponential model for this data, and i would like draw this tendence line in my boxplot (if it is possible, of course.) if someone could help me i would be appreciated. i am trying to solve these, but i am not having sucess. best wishes for all. Rodrigo Gazaffi --- [[alternative HTML version deleted]]

Dear R-users: I have some problems working with lme function, and i would be glad if anyone could help me. this kind of analysis i was used to do with PROC MIXED from SAS, but i would like to move to R, for many reasons... So, the problem is: Imagine the I have 3 factors: fact_A, fact_B and fact_C: The latter I would assume that is random, and the rest of them are fixed. Analysing the