Date: Wed, 25 Jul 2007 08:42:01 -0700
Reply-To: "Nordlund, Dan (DSHS/RDA)" <NordlDJ@DSHS.WA.GOV>
Sender: "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From: "Nordlund, Dan (DSHS/RDA)" <NordlDJ@DSHS.WA.GOV>
Subject: Re: Type IV SS in GLM?
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> -----Original Message-----
> From: SAS(r) Discussion [mailto:SAS-L@LISTSERV.UGA.EDU] On
> Behalf Of Robin High
> Sent: Wednesday, July 25, 2007 8:27 AM
> To: SAS-L@LISTSERV.UGA.EDU
> Subject: Re: Type IV SS in GLM?
> > 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
> 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
Are you using zero (0) to represent missing values, or are these zeros real data values?
Daniel J. Nordlund
Research and Data Analysis
Washington State Department of Social and Health Services
Olympia, WA 98504-5204