Regression Analysis for Categorical Moderators

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Guilford Press, 2004 - Social Science - 202 pages
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Have you ever wondered if birth order effects vary across ethnic groups? Whether a particular clinical intervention is likely to yield dissimilar outcomes for men and women? Or if the effectiveness of a sales promotion is dependent on a market segment? Questions like these can be effectively answered by using a statistical tool known as moderated multiple regression (MMR). This book provides practical guidance for using MMR to better assess whether the relationship between two quantitative variables is moderated by group membership. Included are discussions and fully worked-out examples of how to conduct and interpret MMR analysis, as well as descriptions of computer programs that allow investigators to check whether their MMR test for moderation can be trusted. Using examples from a variety of different disciplines--from psychology and education to management and political science--Herman Aguinis first shows readers how to distinguish between moderated and mediated relationships. Next, he presents a description of the MMR procedure and its basic statistical assumptions, explains how to conduct an MMR analysis using computer packages, and demonstrates how to interpret the resulting output.
  

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Contents

What Is a Moderator Variable
1
Importance of A Priori Rationale in Investigating Moderating
7
Performing and Interpreting Moderated Multiple
22
The Homogeneity of Error Variance Assumption
42
MMRs LowPower Problem
65
Computing Statistical Power
97
Complex MMR Models
117
Further Issues in the Interpretation
138
The Signed Coefficient Rule for Interpreting Moderating
149
Summary and Conclusions
155
APPENDIX A Computation of Bartletts 1937 M Statistic
167
APPENDIX E TheoryBased Power Approximation
173
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About the author (2004)

Herman Aguinis, PhD, is Associate Professor and Director of the Management Programs at the University of Colorado at Denver. He has held visiting appointments at China Agricultural University, City University of Hong Kong, the University of Science of Malaysia, and the University of Santiago de Compostela, in Spain. He has published over 40 articles in refereed journals and delivered over 100 presentations in the United States and abroad on the topics of research methods and statistics, personnel selection, and social power and influence in organizations. He is currently Associate Editor of Organizational Research Methods and serves on the editorial boards of several journals, including Journal of Applied Psychology and Journal of International Business Studies. He has been elected Chair of the Research Methods Division of the Academy of Management for 2003-2004.

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