Date:         Fri, 28 Jan 2005 23:44:56 +0100
Reply-To:     John.Antonakis@unil.ch
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         John.Antonakis@unil.ch
Subject:      Johnson-Neyman procedure
Content-Type: text/plain; charset=ISO-8859-1

Hi:

Does anyone have any SPSS code to test a heterogenous slopes model? I estimated an ANCOVA model and the covariate interactes significantly with the independent variables (I have 3 IVs, and the four-way interaction of the 3IVs with the covariate is significant, as I expected).

Apparently, the Johnson-Neyman procedure should be used in cases where the ANCOVA assumption for equality of regression slopes (on the covariate) are violated.

Best,
John.

*********************************************************************
John Antonakis, Ph.D.
Assistant Professor
University of Lausanne
522-BFSH-1
CH-1015 Lausanne-Dorigny
Switzerland

Tel: ++41 (0)21 692-3461
Fax: ++41 (0)21 692-3495

********************************************************************