Unbalanced factorial designs

Ista,

At 8:01 PM -0500 2/27/09, Ista Zahn wrote:
I see that the email has not gone through because of the attachment.
The file can be downloaded from

http://prometheus.scp.rochester.edu/zlab/sites/default/files/InteractionsAndTypesOfSS.pdf

-Ista

On Fri, Feb 27, 2009 at 7:53 PM, Ista Zahn <izahn at psych.rochester.edu>
wrote:
?Hi everyone,
?This is not a very R-specific question, I hope that will be forgiven.
?I am the teaching assistant for the graduate level regression course
?in the department of clinical and social psychology at my university.
?Many of the students are very confused about the issues that arise
?when analyzing factorial designs with unequal cell sizes.

?I wrote the attached paper in an attempt to clarify these issues for
?them. I'm concerned that my attempt to help them understand the issues
?may just confuse them more, and I'm also concerned that I have be
?mistaken about some of the claims I make in this paper.

?If you have time to look it over at let me know if you spot any
?problems I would greatly appreciate it.

?From the point view of teaching ANOVA, this is great. ?But from the point
of view of teaching how to use R to do the anova, it would be helpful to
include the R commands for the doing the various analyses. (As well as
creating those ?lovely tables.) ?Nice job.
Thanks for the encouragement, and the suggestions. I will definitely
use your suggestion to include the R code in an appendix, but I will
probably remove the table-making commands because few of the student's
use LaTeX and I think it would just confuse them.

Thanks again,
Ista
Bill

?>
?Thank you,
?Ista

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