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...syntax below works, and gives the expected results, in R version 2.0.0, provided that I have loaded packages Matrix, latticeExtra and lme4. However, I cannot get it to work in version 2.2.1. Can anyone tell me how to fit this model in the more recent version? Thanks in anticipation, Nick Galwey barleyprogeny.model1lme <- lme(yield_g_m2 ~ 1, data = barleyprogeny.unbalanced, random = ~ 1|fline + fblock) [[alternative HTML version deleted]]

...ill run at all. When it does run, it gives the error Error in getGroups.data.frame(dataMix, groups) : Invalid formula for groups I think there is something I haven't understood about the syntax of the argument 'random' in lme() . Can anyone explain it to me? Nick Galwey [[alternative HTML version deleted]]

...cex = 1.2) points (c(1.5, 3), c(0.3, 0.005), type = "l") text (c(2.3, 2.3), c(0.25, 0.22), labels = c("Cross-hatched", "area = 0.005"), pos = 4, cex = 1.2) points (c(3, 4), c(0.2, 0.005), type = "l") Can anyone advise? Best wishes, Nick Galwey [[alternative HTML version deleted]]

...yntax is the right one and describe de nested structure correctly? And what could be the meaning of the wrong model? Is there somewhere general information about lmer synthax that we could have missed (not just simple examples)? (I just have an article D. Bates from Rnews vol5/1 and a book of Mr Galwey in addition to the lme4 package help). I have also tried lme (without the covariate) : But the denominator DF seem very strange to me considering the containment method that is used, so I wonder also if the syntax that I use is correct : > model5 <-lme(eclw~landsc + temp + landsc*temp ,...

...without recovery of inter-block information? (N.B. The means with recovery of inter-block information can be obtained from lme() after loading package nlme, but I'd like to do this using an anova approach rather than a mixed modelling approach if possible.) Thank you in anticipation. Nick Galwey