Multilevel Modeling of Individual and Group Level Mediated Effects
- 1 April 2001
- journal article
- Published by Taylor & Francis Ltd in Multivariate Behavioral Research
- Vol. 36 (2), 249-277
- https://doi.org/10.1207/s15327906mbr3602_06
Abstract
This article combines procedures for single-level mediational analysis with multilevel modeling techniques in order to appropriately test mediational effects in clustered data. A simulation study compared the performance of these multilevel mediational models with that of single-level mediational models in clustered data with individual- or group-level initial independent variables, individual- or group-level mediators, and individual level outcomes. The standard errors of mediated effects from the multilevel solution were generally accurate, while those from the single-level procedure were downwardly biased, often by 20% or more. The multilevel advantage was greatest in those situations involving group-level variables, larger group sizes, and higher intraclass correlations in mediator and outcome variables. Multilevel mediational modeling methods were also applied to data from a preventive intervention designed to reduce intentions to use steroids among players on high school football teams. This example illustrates differences between single-level and multilevel mediational modeling in real-world clustered data and shows how the multilevel technique may lead to more accurate results.Keywords
This publication has 28 references indexed in Scilit:
- Centering Decisions in Hierarchical Linear Models: Implications for Research in OrganizationsJournal of Management, 1998
- Introducing Multilevel ModelingPublished by SAGE Publications ,1998
- The interactive effect of alcohol prevention programs in high school classes: An illustration of item homogeneity scaling and multilevel analysis techniques.Published by American Psychological Association (APA) ,1997
- Effects of a multidimensional anabolic steroid prevention intervention. The Adolescents Training and Learning to Avoid Steroids (ATLAS) ProgramJAMA, 1996
- Application of random-effects probit regression models.Journal of Consulting and Clinical Psychology, 1994
- School-based substance abuse prevention: a review of the state of the art in curriculum, 1980–1990Health Education Research, 1992
- The moderator-mediator variable distinction in social psychological research: Conceptual, strategic, and statistical considerations.Journal of Personality and Social Psychology, 1986
- Process AnalysisEvaluation Review, 1981
- Statistical Power with Group Mean as the Unit of AnalysisJournal of Educational Statistics, 1981
- On the Exact Variance of ProductsJournal of the American Statistical Association, 1960