Hi Paul, There should not be any problem. Here is how I visualize the data table looks like:
Obs Male_type  Female_type Response 1 1 1 34 2 1 1 44 3 1 2 38 ⦠⦠⦠⦠If your data frame has the above structure, R will automatically understand that there is replication. Your model form will remain the same. Regards, Indrajit ________________________________ From: Austin Paul <austi...@usc.edu> Cc: "r-help@r-project.org" <r-help@r-project.org> Sent: Tuesday, September 27, 2011 10:57 AM Subject: Re: [R] two-way anova help Hi, Yes. As I explained, the three male and three female types were crossed in all combinations (9 ways). For each of the 9 types, I have 5 replicate tanks (45 total tanks). And from each of the 45 tanks I have 50 observations for size. So the 5 replicates are somehow nested within the two-way interaction? If there was just 1 tank for each of the 9 crosses, yes, it would be very easy to code the two-way anova. It may still be very easy, but I'm not quite sure how to account for the replicate tanks. Hope this makes more sense. Austin On Mon, Sep 26, 2011 at 10:21 PM, Indrajit Sengupta <indra_cali...@yahoo.com> wrote: Can you explain what do you mean by "5 replicate tanks"? > > >Doing a two way anova is very simple in R. You would need to fit a linear >model (lm function). > > > >Eg.: > > >> model <- lm(y ~ male + female + male:female, data =) > > > > >Regards, >Indrajit > > > > > >________________________________ > From: Austin Paul <austi...@usc.edu> >To: r-help@r-project.org >Sent: Tuesday, September 27, 2011 6:13 AM >Subject: [R] two-way anova help > > >Hello, > >I am having some trouble coding a two-way anova due to replicated >treatments. > >I have a factorial design with three male parents and three female parents. >They were mated in all combinations and their babies were grown out and >measured for size. 50 babies were measured for each of the 9 crosses. If I >stopped here, I would have no troubles. But I also have 5 replicate tanks >for each of the 9 crosses. My question is how to I code in the 5 replicate >tanks per treatment? > >Thanks, >Austin > >   [[alternative HTML version deleted]] > >______________________________________________ >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. > > > [[alternative HTML version deleted]]
______________________________________________ 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.
