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Interaction in CAR models-factor defined for spatial units

To: s-news@lists.biostat.wustl.edu
Subject: Interaction in CAR models-factor defined for spatial units
From: "Dora C PEARCE" <dpearce@students.ballarat.edu.au>
Date: Wed, 26 Sep 2007 12:45:32 +1000
Reply-to: dpearce@students.ballarat.edu.au
Dear List,
In CAR models, I have obtained statistically significant 
interaction/modification effects between the continuous dependent and 
continuous independent variables for levels of a dichotomized factor variable. 
The factor is defined on the basis of the spatial units (high or low social 
disadvantge). These spatial units are also used to define the spatial 
connectivity matrix by adjacency of boundaries.

Is it reasonable to use standard procedures to assess the statistical 
significance of each coefficient's difference from zero when separately 
considering the two levels of the dichotomized factor?

Thank you in anticipation,
Dora



Dora Pearce
PhD student
School of Science & Engineering
University of Ballarat
PO Box 663, Ballarat, Victoria, 3353
Email: dpearce@students.ballarat.edu.au
Ph: (03) 5327 9264

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