[R] Repeated measures ANOVA for unbalanc

John Fox jfox at mcmaster.ca
Thu Nov 21 23:19:12 CET 2013

Dear John,

The Anova() function in the car package will perform a traditional
unbalanced repeated-measures ANOVA (or MANOVA). See the R Journal article at

I hope this helps,

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of John Sorkin
> Sent: Thursday, November 21, 2013 5:08 PM
> To: r-help at r-project.org
> Subject: [R] Repeated measures ANOVA for unbalanc
> R 3.0.1
> Windows 7
> Rstudio 0.97.551
> Colleagues,
> The last time I thought about using lmer to run an unbalanced repeated
> measures ANOVA, I found that the package did not return p values or
> SEs. I believe this was because Professor Bates had important questions
> about the theory behind the required computations and was in the
> process of developing a new, improved algorithm. Has this situation
> changed? Has Prof. Bates, or anyone else, implemented a repeated
> measures ANOVA package for R that can be perform unbalanced repeated
> measures ANOVA and which produces valid p values and SEs? If so, what
> is the name of the package?
> Thank you,
> John
> John David Sorkin M.D., Ph.D.
> Professor of Medicine
> Chief, Biostatistics and Informatics
> University of Maryland School of Medicine Division of Gerontology and
> Geriatric Medicine
> 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)
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