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From: "Tom Lane" <tlane@mathworks.com>
Newsgroups: comp.soft-sys.matlab
Subject: Re: Unbalanced ANOVA
Date: Thu, 14 Aug 2008 21:43:37 -0400
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> 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