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Re: @Britanni Baldwin: GLM, ANCOVA in PSPP

From: news
Subject: Re: @Britanni Baldwin: GLM, ANCOVA in PSPP
Date: Tue, 29 Mar 2016 23:03:12 +0200
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David Nichols, longtime chief support statisticians at SPSS, wrote several texts on regression with categorical independent variables and the interpretation of the results. The documents are labbelled catreg1.txt to catreg5.txt and were at the site which no longer exists. They would probably helped here, but I don't find the docs on the web. Anyone with an idea here ?



On 29/03/2016 18:48, Dr. Oliver Walter wrote:
Dear Britanni,

PSPP can do GLM analysis: An experimental module was implemented in former versions of PSPP's GUI (Windows version) and only showed up when data was available. Now (PSPP 0.10.0) it is "fully" implemented in the GUI and the "warning" label doesn't appear anymore. I compared the results of a 3x2 ANOVA done with another statistics software with the results of PSPP GLM. The results were identical. This is not a thorough test of PSPP GLM, of course, but it indicates that the module seems to work properly.

Another topic is ANCOVA: As far as I know PSPP GML does not support ANCOVA, at least not in the GUI (Windows version), but you could calculate an ANCOVA by using linear regression analysis which is already implemented in PSPP. ANCOVA is only a special variant of a linear regression analysis: Transform your IVs into sets of dummy variables (one set per IV), put all of them (minus 1 per set) into a regression analysis, add your covariates and do not include interaction effects. This is ANCOVA.



Dr. Oliver Walter
Gabelsbergerstr. 27
24148 Kiel

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Subject: Pspp-users Digest, Vol 118, Issue 28

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  1. Re: technical question (Alan Mead)


Message: 1
Date: Mon, 28 Mar 2016 11:00:08 -0500
From: Alan Mead <address@hidden>
To: Brittani Baldwin <address@hidden>,
"address@hidden" <address@hidden>
Subject: Re: technical question
Message-ID: <address@hidden>
Content-Type: text/plain; charset="windows-1252"


I would use one of the versions of the manual here:

such as this one:

or the PDF version:

PSPP has capabilities, like GLM, that the graphical interface doesn't
express (this is also true of SPSS; for example, one cannot access
MANOVA from the GUI). But you can use syntax to perform a GLM analysis,
as described here:

The GLM command doesn't have any explicit support for ANCOVA and I've
never used GLM to perform the analysis, but these links suggest that
you're correct that it's possible:

Let us know if you have difficulty or questions using the syntax for
your analysis.  If you do have problems, please identify the platform
(Windows, MacOS, etc.) and version (from Help > About) that you are
using.  PSPP just releases a new version, 0.10.0, but aside from various
small improvements, I don't think it affects what you are doing.


On 3/28/2016 10:10 AM, Brittani Baldwin wrote:

I downloaded the recent version of PSPP and according to the manual I
found (link below), it should have an options for two way anova,
ancova, etc. However,  I don?t have an option called ?General Linear
Model? under ?Analyze? where one could do an ANCOVA. I would
appreciate help with this.

Brittani Baldwin Gracey, PsyD

Clinical Psychologist/Neuropsychologist

Arkansas State Hospital

Division of Behavioral Health Services (DBHS)


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Alan D. Mead, Ph.D.
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