@Britanni Baldwin: GLM, ANCOVA in PSPP

[Dr. Oliver Walter]

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.

Sincerely,

Oliver

---
Dr. Oliver Walter
Gabelsbergerstr. 27
24148 Kiel
Germany


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Sent: Tuesday, March 29, 2016 6:00 PM
Subject: Pspp-users Digest, Vol 118, Issue 28


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>   1. Re: technical question (Alan Mead)
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> ----------------------------------------------------------------------
>
> 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>
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>
> Brittani,
>
> I would use one of the versions of the manual here:
>
> https://www.gnu.org/software/pspp/manual/
>
> such as this one:
>
> https://www.gnu.org/software/pspp/manual/html_node/index.html
>
> or the PDF version:
>
> https://www.gnu.org/software/pspp/manual/pspp.pdf
>
> 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:
>
> https://www.gnu.org/software/pspp/manual/html_node/GLM.html#GLM
>
> 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:
>
> http://www.theanalysisfactor.com/general-linear-model-anova-regression-same-model/
> http://stats.stackexchange.com/questions/21229/difference-between-ancova-and-hierarchical-regression
>
> 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.
>
> -Alan
>
>
>
> 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.
> >
> >
> >
> > https://books.google.com/books?id=pH21CgAAQBAJ&pg=PA53&lpg=PA53&dq=pspp+ancova&source=bl&ots=SMj13ZX7Ma&sig=GhXUEMEmyjESMZUstpYSMQEa4gs&hl=en&sa=X&ved=0ahUKEwia8tyWz-PLAhWBnYMKHRk-CsQQ6AEIRzAH#v=onepage&q=pspp%20ancova&f=false
> >
> >
> >
> > Brittani Baldwin Gracey, PsyD
> >
> > Clinical Psychologist/Neuropsychologist
> >
> > Arkansas State Hospital
> >
> > Division of Behavioral Health Services (DBHS)
> >
> > 501-251-6556
> >
> >
> >
> >
> >
> > _______________________________________________
> > Pspp-users mailing list
> > address@hidden
> > https://lists.gnu.org/mailman/listinfo/pspp-users
>
> --
>
> Alan D. Mead, Ph.D.
> President, Talent Algorithms Inc.
>
> science + technology = better workers
>
> +815.588.3846 (Office)
> +267.334.4143 (Mobile)
>
> http://www.alanmead.org
>
> I've... seen things you people wouldn't believe...
> functions on fire in a copy of Orion.
> I watched C-Sharp glitter in the dark near a programmable gate.
> All those moments will be lost in time, like Ruby... on... Rails... Time 
> for Pi.
>
>          --"The Register" user Alister, applying the famous
>            "Blade Runner" speech to software development
>
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