Re: [R] 2 way ANOVA with possible pseudoreplication

2009-04-30 Thread S Ellison
Well, it's clearly not pseudoreplication if it's not replication! But the observations within animal could well be associated. You seem to have a straightforward experiment with multiple treatment combinations on multiple subjects. You could do several things. The most obvious is probably to

[R] 2 way ANOVA with possible pseudoreplication

2009-04-29 Thread nat_h
Hi, I have an experiment with 2 independant factors which I have been trying to analyse in R. The problem is that there are several data points recorded on the same animal. However, no combination of treatments is repeated on the same animal. All possible combinations of treatments are done in

Re: [R] 2 way ANOVA with possible pseudoreplication

2009-04-29 Thread Andrew Dolman
Hi Natalie, It sounds like a mixed model might be appropriate but it's not completely clear what your data are like. How many levels are there of each factor? Or is each factor just binary (treatment or no treatment)? What did you measure as the response? It's a good idea to post a sample of your