Re: [R] anova post hoc tests

From: RICHARD M. HEIBERGER <rmh_at_temple.edu>
Date: Fri, 28 May 2010 10:00:52 -0400

Download and install

install.packages("RcmdrPlugin.HH")
library(RcmdrPlugin.HH)

Then there are two options.

The Rcmdr menu item
Statistics > Means > One-way ANOVA...
has a checkbox for pairwise comparison of means" It uses glht in the multcomp package.

The second option, which I prefer, is to use the MMC (Mean-mean Multiple Comparisons) plot. I describe the one-way ANOVA use here. See the help file for higher-order designs and user-specified contrasts.

After running the One-way ANOVA above,
click the Rcmdr menu item
Models > Graphs > MMC plot... (HH)
Select the model and click OK.

If the means of the groups are close together, you might need to check the box for the tiebreaker plot. You will need to record graph history if you
need the teibreaker plot as it appears on a second page.

Rich

On Fri, May 28, 2010 at 8:11 AM, Iasonas Lamprianou <lamprianou_at_yahoo.com>wrote:

> Hi everybody
>
> does anyone know how I can run ANOVA post-hoc tests using R commander or R
> in general?
>
> Thank you
>
>
> Dr. Iasonas Lamprianou
>
>
>
>
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