Date:         Tue, 1 May 2007 19:25:07 -0400
Reply-To:     Stephen Salbod <ssalbod@pace.edu>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         Stephen Salbod <ssalbod@pace.edu>
Subject:      How to graph an interaction with covariates
Content-Type: text/plain; charset=us-ascii

Good Evening,

                How do I deal with covariates when I want to graph a
significant interaction (regression analysis). I want to graph a 2-way
interaction where the outcome is continuous and the two predictors are
continuous and dichotomous, respectively. Also include in the analysis were
ten covariates: eight dichotomous (0,1) and two continuous.

                What I have done is set the dichotomous variables equal to 0
and use the mean for the two continuous variables; that is, I add the
weighted means of the two continuous variables to the constant. I then
proceeded follow the  steps outline in Jaccard et al (1990) and Aiken and
West (1991) to generate plot points.

                My question is: Did I handle the covariates correctly?



                Any advice will be greatly appreciated.

                Thank you,



                Stephen Salbod, Pace University, NYC