Re: [R] Kenward-Roger correction in lme

From: Ben Bolker <>
Date: Mon, 25 Feb 2008 19:11:24 +0000 (UTC)

stian <at> <stian <at>> writes:
> Hi,I am wondering how to conduct Kenward-Roger correction in
> the linear mixed model using R. Any idea?
> Thanks a lot,
> Suyan

  Not really possible, I'm afraid. Having already invested a huge amount of time in making lme4 available (and this is the cutting-edge version of linear mixed models for R), Doug Bates has declined to spend effort implementing K-R because (1) he's not convinced of the appropriateness of adjusting F-distribution degrees of freedom in this way, (2) he doesn't think that the K-R algorithm will be feasible for the sorts of large-data problems he's interested in, (3) [can't find the reference] he finds the correspondence between K-R's notation and his difficult.

  This should probably go on an FAQ list somewhere:

By the way, RSiteSearch("Kenward-Roger") would have yielded some information ...

  For further information, please see the r-sig-mixed archives.

    Ben Bolker mailing list PLEASE do read the posting guide and provide commented, minimal, self-contained, reproducible code. Received on Mon 25 Feb 2008 - 19:17:18 GMT

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.2.0, at Mon 25 Feb 2008 - 21:30:16 GMT.

Mailing list information is available at Please read the posting guide before posting to the list.

list of date sections of archive