[R-sig-ME] Fwd: Re: [R] ANOVA and Pseudoreplication in R

[David Duffy]

  On Fri, Feb 25, 2011 at 9:08 AM, Ben Ward<benjamin.ward at bathspa.org>  wrote:
> [Much snippage]
>  The Lineage (bottle) is also a factor then, with 5 levels (1,2,3,4,5).
>  Because they may be different.
>
>  Then when the zones have appeared after a day or 2. I take 4 diameter
>  measurements from each zone, across the zone at different angles, to take
>  account for the fact, that there may be a weird shape, or not quite
>  circular.
>
>  I'm concerned about pseudoreplication, such as the multiple readings from
>  one disk, and the 5 lineages - which might be different from one another in
>  each of the Two "EV." treatments, but not with "NE." treatments.

Why not plot the results and see if there _are_ differences
across your four readings, and your five lineages within each arm. Then 
read:

http://lme4.r-forge.r-project.org/book/Ch2.pdf