Paired (aka. Repeated measures, aka. within-Ss) tests can be achieved
by using aov() and specifying the within-Ss effect in the error term:
my_aov = aov( dependent_variable~between_Ss_variable*within_Ss_variable
+ Error(Ss_id/(within_Ss_variable)))
summary(my_aov)
On Mon, Apr 20, 2009 at 10:25 AM, A Ezhil ezhi...@yahoo.com wrote:
Hi,
I have an experimental data with 2 factors: visit and treatment. Each subject
has 2 visits and on each visit they get a treatment. We take samples before
and after treatment. I can easily to do the 2-way ANOVA in R with visit and
treatment as factors.
anova( lm(data ~ visit*treatment) )
If I want to do the same 2-way ANOVA for the paired samples, how can I do
that? Is there any R packages for that?
Thanks in advance.
Kind regards,
Ezhil
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