Re: [R] Re peated Measure ANOVA-Old question

From: Mark Difford <mark_difford_at_yahoo.co.uk>
Date: Wed, 30 Jul 2008 00:49:54 -0700 (PDT)

Hi Chunhao,

If you carefully read the posting that was referred to you will see that lme() and not lmer() was used as an example (for using with the multcomp package). lmer() was only mentioned as an aside... lmer() is S4 and doesn't work with multcomp, which is S3.

Apropos of specifying random effects: an example was given in the posting showing that aov(... +Error(...)) and lme(..., random =...) give the same result. Use that as your guideline.

HTH, Mark.

ctu wrote:
>
> Tank you (Anna & Mark) very much for this super information
> Let me confirm that IF I want to perform the RM-ANOVA
> I should use "lmer" and perform the post-hoc test by using "glht", right?
>
> Because I am not so familiar with "lmer" so I have two more questions.
> Let me use that following example again,
> 1. Is the random effect statement correct? if no what will be?
> 2. What did I do wrong in glht?
>
>
> require(lme4);require(nlme)
> group <-rep(rep(1:2, c(5,5)), 3);time <-rep(1:3, rep(10,3));subject <-
> rep(1:10,3)
> p.pa <- c(92, 44, 49, 52, 41, 34, 32, 65, 47, 58, 94, 82, 48, 60, 47,
> 46, 41, 73, 60, 69, 95, 53, 44, 66, 62, 46, 53, 73, 84, 79)
> P.PA <- data.frame(subject, group, time, p.pa)
> P.PA$group=factor(P.PA$group);P.PA$time=factor(P.PA$time)
> P.PA$subject=factor(P.PA$subject)
>
> tlmer<-lmer (p.pa ~ time * group + (time*group | subject), data=P.PA )
>

>> summary(glht(tlmer,linfct=mcp(group="Tukey")))

> Error in UseMethod("fixef") : no applicable method for "fixef"
> In addition: Warning message
>
> Thank you very much
> Chunhao
>
> ______________________________________________
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
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>
>
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Received on Wed 30 Jul 2008 - 08:01:18 GMT

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