[R] Denominator Degrees of Freedom in lme() -- Adjusting and Understanding Them
Douglas Bates
bates at stat.wisc.edu
Tue Oct 21 23:54:31 CEST 2003
Contributions of code to provide alternative calculations of
denominator degrees of freedom are welcome :-)
I think it would be good to bear in mind that the use of the t and F
distributions for models with mixed effects is already an
approximation. If your design is such that you end up with a very few
denominator degrees of freedom then the whole question of whether you
should be using F or t distributions in the first place becomes
problematic. If the number of denominator degrees of freedom is
moderate than the distinction between alternative methods becomes
unimportant.
--
Douglas Bates bates at stat.wisc.edu
Statistics Department 608/262-2598
University of Wisconsin - Madison http://www.stat.wisc.edu/~bates/
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