[R] Conservative "ANOVA tables" in lmer

Spencer Graves spencer.graves at pdf.com
Sun Sep 10 08:54:50 CEST 2006

Hi, Doug, et al.: 

      I'll volunteer to do the same, which is an extension of much of 
what I've been doing for R Help for a while now. 

      Regarding writing a FAQ, what about a Wiki entry (and maybe 
ultimately a vignette)?  This thread provides notes around which such 
could be built.  Another piece might be an example from Scheffé (1958), 
which I sent as a reply to an earlier comment on this thread, (foolishly 
sent without reducing the "cc" list, which means it "awaits moderator 
approval").   Each time a question of this nature arises, someone checks 
the Wiki, edits adds something to it if necessary, then replies to the 
list with the reference to the appropriate Wiki entry. 

      Spencer Graves

Andrew Robinson wrote:
> On Thu, Sep 07, 2006 at 07:59:58AM -0500, Douglas Bates wrote:
>> I would be happy to re-institute p-values for fixed effects in the
>> summary and anova methods for lmer objects using a denominator degrees
>> of freedom based on the trace of the hat matrix or the rank of Z:X if
>> others will volunteer to respond to the "these answers are obviously
>> wrong because they don't agree with <whatever> and the idiot who wrote
>> this software should be thrashed to within an inch of his life"
>> messages.  I don't have the patience.
> This seems to be more than fair to me.  I'll volunteer to help explain
> why the anova.lmer() output doesn't match SAS, etc.  Is it worth
> putting a caveat in the output and the help files?  Is it even worth
> writing a FAQ about this?
> Cheers
> Andrew

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