Date: Thu, 21 Feb 2008 11:58:38 -0500
Reply-To: "Zdaniuk, Bozena" <bozena@pitt.edu>
Sender: "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From: "Zdaniuk, Bozena" <bozena@pitt.edu>
Subject: Re: SPSS: Interaction of a covariate and factor
In-Reply-To: <200802211558.m1LBl75Q016039@mailgw.cc.uga.edu>
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Hello, assuming you are running your analysis using GLM, please use the following subcommand:
/PRINT = DESCRIPTIVE PARAMETER
The keyword PARAMETER will print out the regression coefficients for covariate-outcome separately for each level of the factor variable and you can see where your interaction is coming from. Let me know if you have any additional questions about it.
Bozena
Bozena Zdaniuk, Ph.D.
University of Pittsburgh
UCSUR, 6th Fl.
121 University Place
Pittsburgh, PA 15260
Ph.: 412-624-5736
Fax: 412-624-4810
Email: bozena@pitt.edu
-----Original Message-----
From: SPSSX(r) Discussion [mailto:SPSSX-L@LISTSERV.UGA.EDU] On Behalf Of Talk Stats
Sent: Thursday, February 21, 2008 10:59 AM
To: SPSSX-L@LISTSERV.UGA.EDU
Subject: SPSS: Interaction of a covariate and factor
Hi,
After I have found that the interaction between a covariate and factor is
significant, I would like to know if each level of the factor has a
significant interaction term with the covariate, or if only one of the
levels is different than the other two in terms of the interaction term.
I can't figure out how to do this in SPSS. It appears that I need to write
a contrast script, but I can't create a contrast for a covariate, and the
resulting output does not display the interaction effect.
Any ideas would be greatly appreciated. I've attached my code below.
Thanks.
Sincerely,
Jon
Notes: JND is the dependent, Baseline is the covariate, Location is the
factor.
UNIANOVA
JND WITH Baseline BY Location
/CONTRAST (Location)=special(-2 1 1, 1 -2 1, 1 1 -2)
/METHOD = SSTYPE(3)
/INTERCEPT = EXCLUDE
/CRITERIA = ALPHA(.05)
/DESIGN = Baseline Location Baseline by Location.
--
This question was originally posted at:
http://www.talkstats.com/showthread.php?t=3432
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