[R] Unbalanced ANOVA in R?

Fredrik Karlsson fredrik.karlsson at ling.umu.se
Fri Mar 8 06:56:17 CET 2002

Hi all

I'm trying to complete a textbook example originally designed for SPSS
in R, and I therefore need to find out how to compute an unbalanced

I did a search on the mailinglist archives an found a post by Prof.
Ripley saying one should use the lme function for (among other things)
unbalanced ANOVAs, but I have not been able to use this object.
My code gives me an error.. Why is that ?

> aov(lme(DELAY ~ DOSE + TRIALS,data=epinuneq))
> Error in getGroups.data.frame(dataMix, groups) : 
> 	Invalid formula for groups

Any ideas? How do I get an ANOVA computation that can handle uniqual
sampe sizes in R?


r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-help-request at stat.math.ethz.ch

More information about the R-help mailing list