'Missing' tests for lmer models
Dear Henric, Thanks for this. I think that what confused me was that the original message appears in a linked URL, not directly in the list archive. Anyway, I believe that I effectively answered the question: test="chisq" is equivalent to the previous test="Wald", and test="F" will produce a Kenward-Roger F test. Both tests are Wald tests, hence the change in options. And, as I said, ?Anova could be clearer (and will be in the next release). Best, John On Thu, 11 Oct 2012 15:15:12 +0200
"Henric (Nilsson) Winell" <nilsson.henric at gmail.com> wrote:
Dear John, On 2012-10-10 04:52, John Fox wrote:
Dear David and Luke, I missed the beginning of this thread and couldn't find it in the R-sig-ME list archive,
The thread started here: https://stat.ethz.ch/pipermail/r-sig-mixed-models/2012q3/019141.html and then continued here: https://stat.ethz.ch/pipermail/r-sig-mixed-models/2012q4/019236.html Best regards, Henric so it's not clear to me what the issue is -- sorry -- but I should clarify that Anova() for mer objects only does Wald tests -- either Wald chisquare tests or F-tests, the latter with Kenward-Roger df computed via the pbkrtest package. I think that this could be clearer in ?Anova.
Best, John ------------------------------------------------ John Fox Sen. William McMaster Prof. of Social Statistics Department of Sociology McMaster University Hamilton, Ontario, Canada http://socserv.mcmaster.ca/jfox/ On Wed, 10 Oct 2012 11:14:13 +1000 David Duffy <David.Duffy at qimr.edu.au> wrote:
On Tue, 9 Oct 2012, Luke Duncan wrote:
New computer/32bit R: R version 2.15.1 (2012-06-22) Platform: i386-pc-mingw32/i386 (32-bit) other attached packages: [1] lme4_0.999999-0 Matrix_1.0-6 car_2.0-13 Old computer/32bit R: R version 2.13.1 (2011-07-08) Platform: i386-pc-mingw32/i386 (32-bit) other attached packages: [1] lme4_0.999375-42 Matrix_0.9996875-3 car_2.0-11
Yes, these straddle a moderately large version change in lme4: see the intro at http://lme4.r-forge.r-project.org/ The most recent versions of Anova.II.mer() only supports c("chisq", "F"). John Fox may reintroduce Wald tests, but you can always do them yourself. Cheers, David Duffy. -- | David Duffy (MBBS PhD) ,-_|\ | email: davidD at qimr.edu.au ph: INT+61+7+3362-0217 fax: -0101 / * | Epidemiology Unit, Queensland Institute of Medical Research \_,-._/ | 300 Herston Rd, Brisbane, Queensland 4029, Australia GPG 4D0B994A v
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------------------------------------------------ John Fox Sen. William McMaster Prof. of Social Statistics Department of Sociology McMaster University Hamilton, Ontario, Canada http://socserv.mcmaster.ca/jfox/