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Base-rates, cut-points and interaction effects: the problem with dichotomized continuous variables

Published online by Cambridge University Press:  09 July 2009

H. O. F. Veiel
H. O. F. Veiel*
Affiliation:
Central Institute of Mental Health, Mannheim, West Germany
*
1Address for correspondence: Dr H. O. F. Veiel, Central Institute of Mental Health, J–5, D-6800 Mannheim 1, West Germany.
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Synopsis

On the background of the recent discussion about the appropriateness of linear difference and ratio models for testing interaction effects of social support and stress, it is argued that interaction effects are basically unstable when dichotomized continuous variables are analysed. A data set with known interrelationships of the continuous variables ‘stress’, ‘social support’, and ‘depression’ was simulated and analysed in tabular format. It is shown that the choice of cut-points for the independent variables crucially determines the size and presence of interaction effects in ratio analysis models.

Type
Research Article
Information
Psychological Medicine , Volume 18 , Issue 3 , August 1988 , pp. 703 - 710
Copyright
Copyright © Cambridge University Press 1988

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