Date:         Wed, 25 Jul 2007 10:26:44 -0500
Reply-To:     Robin High <robinh@UNLSERVE.UNL.EDU>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Robin High <robinh@UNLSERVE.UNL.EDU>
Subject:      Re: Type IV SS in GLM?
Comments: To: "Dennis G. Fisher, Ph.d." <dfisher@CSULB.EDU>
In-Reply-To:  <46A74F0F.5010102@csulb.edu>
Content-Type: TEXT/PLAIN; charset=US-ASCII

> The usual advice for using type IV SS in PROC GLM is to use them when
> you have a missing cell and there is more than a 1-way ANOVA.  In my
> case I have a 2 x 4 factorial ANOVA in which two of the cells have all
> values of 0.  Is it appropriate, or even permissible, to use type IV SS
> in this instance?  TIA

Dennis,

Yes, and if you have access to "Analysis of Messy Data", Vol 1, by
Milliken and Johnson, Chapter 13-14 addresses these issues quite nicely
with interpretation of a 'cell means' model.

Robin High