On Tue, May 13, 2008 at 1:40 PM, James Hudson <[EMAIL PROTECTED]> wrote: > Please advise the proper format for coding the random effects of a > split-plot experiment WITH repeated measures. I have been unable to > figure out how to use either lme or lmer's "grouping" to properly > assign the error terms. I am measuring univariate responses. > > Here is the set-up: > WP - whole plot factor > SP - split-plot factor > SSP - split-split-plot factor, also the repeated measure (time) > Plot - replicates of each SSP treatment > > How do I combine the split-plot effects with the repeated measures [ > Time|Plot(WP*SP) ] effect into a random statement?
There has been a long exchange on the [EMAIL PROTECTED] mailing list over the last few days about a similar coding issue. You can check the archives at https://stat.ethz.ch/pipermail/r-sig-mixed-models/ To be able to answer your question I think we would need more information about exactly which variances and covariances of random effects you wish to estimate. I realize that many software packages allow you to fit "the" repeated measures model, whether or not it is appropriate for your data. In R you have more flexibility but that means that you must be more specific. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
