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...ot;off the shelf" and use for this - or must I create my own? (would need guidance to do the latter) 3. In any case, can you instruct me about the proper syntax for the main, fixed and random formulae - or for the seemingly-niftier nlmer interface? Here are some of the errors I get: Error in nlmeCall[[i]] <- NULL : subscript out of bounds Error in nlme.formula(): element 1 is empty; the part of the args list of 'is.numeric' being evaluated was: (start) By the way, the data integrity is fine. I have no problem running lmer on the same dataset. I use R 2.8.1 for Windows and...

...random = list(Am~1,Q~1,LCP~1),groups=~species, na.action=na.omit). When I use this, I get an error message: > nlme(model=photosynthesis~photo(irradiance,Am,Q,LCP),data=marouane.data, + fixed=list(Am~1,Q~1,LCP~1),groups=~species, + random=list(Am~1,Q~1,LCP~1), + na.action = na.omit) Error in nlmeCall[[i]] <- NULL : subscript out of bounds Bill Shipley [[alternative HTML version deleted]]