On Mon, 14 Apr 2003 20:30:07 +0100, "Rob Lambkin"
> thanks for that unfortunately my group size is only 12 max
[ snip, rest]
Samples of 12?
Let's back up and ask, What worried you about normality?
- things look odd to you?
- it seems safer that way?
- you are suspicious about data generation?
Samples of 12 don't lend themselves to strong
conclusions about their shapes. You have certain
hypotheses and assumptions, which have not been
spelled out. So, I wonder if you are (a) overly concerned;
or else, (b) taking insufficient precautions?
Keep in mind this worry, that the assumptions for testing
with *ranks* are, in practice, almost as hard to meet
(about similar shapes) as the assumptions for ANOVA.
Again, what is the reason that you are worried?
Why do you think it will be enough to transform to ranks?
- You are saying that actual averages don't matter, but
average-ranks *do*? (and you don't mention outliers....?)