[R-sig-ME] calculate degree of freedom lmer

[Ben Bolker]

Søren Højsgaard <Soren.Hojsgaard at ...> writes:

> 
> Seasons greetings!
> 
> As mentioned on http://glmm.wikidot.com/faq, pbkrtest provides an 
> implementation of a Kenward-Roger
> approximation for calculating degrees of freedom
> (the function KRmodcomp()). What is not mentioned is
> that pbkrtest also implements a parametric bootstrap approach 
> for testing two nested models (the
> function PBmodcomp()).

  I think this was mentioned there, just not in exactly the same place
on the page.  I've added/cleaned up a bit now -- let me know if
it's not clear or needs something added.

  Ben Bolker