I am having problems using the /lme /command to fit mixed models. I have
a data set similar to longitudinal data, except the hypothesised
correlation is between observations taken from different individuals in
the same family rather than from the same individual at different times.
As soon as I try to specify any correlation structure other than
independent, I get the error message "/Error in x$formula : object of
type 'closure' is not subsettable/". Have you any idea what /R /is
objecting to and how I might fix it, and if not, can you suggest h
any other way I can get R to fit a linear mixed model? The data set is
VERY unbalanced with almost 2/3 of the "families" being single
individuals, so maybe /R/ doesn't like being told to find correlation in
univariate data subsets. ANY advice is welcome!
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