Re: [R] Conservative "ANOVA tables" in lmer

From: John Sorkin <jsorkin_at_grecc.umaryland.edu>
Date: Sun 10 Sep 2006 - 07:50:54 GMT

Spencer,
Would you add the reference to the WIKI? I think it would help round out this thread. John

John Sorkin M.D., Ph.D.
Chief, Biostatistics and Informatics
Baltimore VA Medical Center GRECC,
University of Maryland School of Medicine Claude D. Pepper OAIC, University of Maryland Clinical Nutrition Research Unit, and Baltimore VA Center Stroke of Excellence

University of Maryland School of Medicine Division of Gerontology
Baltimore VA Medical Center
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524

(Phone) 410-605-7119
(Fax) 410-605-7913 (Please call phone number above prior to faxing) jsorkin@grecc.umaryland.edu

>>> Spencer Graves <spencer.graves@pdf.com> 09/10/06 2:54 AM >>>
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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