Re: [R] lmer, p-values and all that

From: Doran, Harold <HDoran_at_air.org>
Date: Sat 20 May 2006 - 22:47:52 EST


here here. I had the wonderful benefit of sitting in a coffee shop in San Francisco with Doug listening to an excellent explanation. I only wish we could replicate that as an FAQ!

Thanks for this, Doug.

-----Original Message-----

From:	r-help-bounces@stat.math.ethz.ch on behalf of Marc Schwartz
Sent:	Fri 5/19/2006 7:54 PM
To:	Frank E Harrell Jr
Cc:	Douglas Bates; r-help
Subject:	Re: [R] lmer, p-values and all that

On Fri, 2006-05-19 at 17:44 -0500, Frank E Harrell Jr wrote:
> Douglas Bates wrote:
> > Users are often surprised and alarmed that the summary of a linear
> . . . .
> Doug,
>
> I have been needing this kind of explanation. That is very helpful.
> Thank you. I do a lot with penalized MLEs for ordinary regression and
> logistic models and know that getting sensible P-values is not
> straightforward even in that far simpler situation.
>
> Frank

I would like to echo Frank's comments and say "Thanks" to Doug for taking the time to provide this post.

I would also like to suggest that this issue has indeed become a FAQ and would like to recommend that an addition to the main R FAQ be made (wording TBD) but along the lines of:

  Why are p values not displayed when using lmer()?

The response could be:

  Doug Bates has kindly provided an extensive response in a post to the   r-help list, which can be reviewed at:

  https://stat.ethz.ch/pipermail/r-help/2006-May/094765.html

This might save Doug, Harold and Spencer (I am probably missing some others here) keystrokes in the future... :-)

Best regards,

Marc Schwartz



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