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 > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > -- Mike Lawrence Graduate Student Department of Psychology Dalhousie University Looking to arrange a meeting? Check my public calendar: http://tr.im/mikes_public_calendar ~ Certainty is folly... I think. ~ ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
