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2008 Aug 22
1
lme questions re: repeated measures & covariance structure
Hello,
We are attempting to use nlme to fit a linear mixed model to explain bird
abundance as a function of habitat:
lme(abundance~habitat-1,data=data,method="ML",random=~1|sampleunit)
The data consist of repeated counts of birds in sample units across multiple
years, and we have two questions:
1) Is it necessary (and, if so, how) to specify the repeated measure
(years)? As written, the above code does not.
2) How can we specify a Toeplitz heterogeneous covariance structure f...