[R-sig-ME] significance level in lme4 and lmerTest
j|ox @end|ng |rom mcm@@ter@c@
Tue Jul 5 15:04:41 CEST 2022
On 2022-07-05 8:14 a.m., Hasibe Kahraman wrote:
> I used the lme4 package for modelling my data and ANOVA Type III (Version 3.0-12; Fox & Weisberg, 2019). I reported the results of LME analyses in my manuscript (see below):
> The main effects of group and prime type were significant (F(1,139.02)=6.5005, p=.011; F(2,197.66)=8.5271, p<.001, respectively), with a robust two-way interaction between Group and Prime Type (F(2,190.45)=11.9593, p<.0001)
> However, one reviewer asked that I should specify which p-value is my "significance" level. Therefore, could I possibly learn whether it is set to .05 or .01?
This is really a statistical question and not a software question.
lmerTest::anova() (which you mention in the subject of your message) and
car::Anova() (which you appear to reference in the body of your message)
both report p-values. If you have an alpha level for the tests, you
should simply say what it is. Since you consider p = .011 "significant,"
the alpha level you have in mind is apparently .05.
I hesitate to probe below the surface, for example, to ask whether you
coded contrasts correctly to get type-III tests from Anova() or whether
you're really interested in the main effects in light of the interactions.
I hope this helps,
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John Fox, Professor Emeritus
Hamilton, Ontario, Canada
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