[R] formula for degrees of freedom for nonlinear mixed model in nlme

[Ben Bolker]

David Winsemius wrote:
> 
> 
> The FAQ 7.35 links to this posting:
> 
> https://stat.ethz.ch/pipermail/r-help/2006-May/094765.html
> 
> 

Actually, this is a different question from the usual "why don't I
get denominator df?" question -- it is "how are these calculated"
(since the poster is using nlme, not (n)lmer).  The answer in this
case is "check Pinheiro and Bates 2000" -- I don't remember the
page number exactly, looks like it's page 91 -- see Google books:
<http://tinyurl.com/ntygq3>

If the denominator df don't agree with your intuition, you can
always recompute p-values with the appropriate den df:
(two-tailed) 2*pt(abs(t.score),df=dendf,lower.tail=FALSE)

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