Date: Tue, 27 Sep 2005 09:14:27 +0200
Reply-To: Marta García-Granero
Sender: "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From: Marta García-Granero
Organization: Asesoría Bioestadística
Subject: Re: Help with nested design syntax MANCOVA
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Although without a more complete explanation of your data design I
can't be sure, I see two errors in your model:
- A nested factor can NEVER interact with the nesting factor. That
makes the terms: location*severity and treat_gp*location*severity
wrong. Are you sure it is nested? Explain it with more detail.
- Also, you say you have 3 factors, and I see 5 (gender, treatment,
group, location and severity, the last one being nested within
location). Gender cannot be a covariate, as you have wrongly indicated
in your model, because it's a qualitative variable (a factor), not a
Perhaps someone with more expertise in MANOVA models (I use don't use
it very often, nor I have read a lot about it) can help you more.
JH> I cannot figure out if my nested design sytax is working.
JH> Can you have a look and see if I've coded it correctly. I have 3 factors,
JH> treatment group, location and severity. Severity is nested within
JH> recov_sp adh_scor BY treat_gp location severity WITH gender miqr_sum
JH> /METHOD = SSTYPE(3)
JH> /INTERCEPT = INCLUDE
JH> /CRITERIA = ALPHA(.05)
JH> /DESIGN = gender miqr_sum treat_gp location severity(location)
JH> treat_gp*location treat_gp*severity location*severity
JH> treat_gp*location*severity .