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Subject: Re: Unbalanced ANOVA
Date: Fri, 29 May 2009 11:41:01 +0000 (UTC)
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Hi,

I'm new to MatLab and have come against the same problem as Suman. Only I have about 150 different groups, and the number of elements in each varies from 30 to 7000, with no two groups having the same number of elements necessarily. Also the values of the elements themselves are completely unrelated to each other (they are microarray probe log2ratios). 
Anova1 is the test I need to do, but I don't quite understand how to apply the function for my case. Can anyone please show me some pointers?  I've read Don's reply to Suman but I'm not clear on what it means.

Thanks!

"Tom Lane" <tlane@mathworks.com> wrote in message <g82n0a$eqr$1@fred.mathworks.com>...
> > Thanks for your reply. This is how I have been using
> > anova1 before but my question is, since the groups have
> > unequal elements, is the anova1 test still valid or does
> > one have to make any changes?
> 
> Suman, anova1 accepts unbalanced data and handles that situation properly.
> 
> In contrast, you can't use unbalanced data with anova2 -- the input format 
> just doesn't permit it.  Fortunately you can use anovan for unbalanced data 
> with two or more grouping variables.
> 
> -- Tom 
> 
>