The Choice between fixed and random effects models: some considerations for educational research
AbstractWe discuss the use of fixed and random effects models in the context of educational research and set out the assumptions behind the two modelling approaches. To illustrate the issues that should be considered when choosing between these approaches, we analyse the determinants of pupil achievement in primary school, using data from the Avon Longitudinal Study of Parents and Children. We conclude that a fixed effects approach will be preferable in scenarios where the primary interest is in policy-relevant inference about the effects of individual characteristics, but the process through which pupils are selected into schools is poorly understood or the data are too limited to adjust for the effects of selection. In this context, the robustness of the fixed effects approach to the random effects assumption is attractive, and educational researchers should consider using it, even if only to assess the robustness of estimates obtained from random effects models. On the other hand, when the selection mechanism is fairly well understood and the researcher has access to rich data, the random effects model should naturally be preferred because it can produce policy-relevant estimates while allowing a wider range of research questions to be addressed. Moreover, random effects estimators of regression coefficients and shrinkage estimators of school effects are more statistically efficient than those for fixed effects.
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Bibliographic InfoPaper provided by Department of Economics, University of Bristol, UK in its series The Centre for Market and Public Organisation with number 10/240.
Length: 29 pages
Date of creation: Jun 2010
Date of revision:
fixed effects; random effects; multilevel modelling; education; pupil achievement;
Other versions of this item:
- Paul Clarke & Claire Crawford & Fiona Steele & Anna Vignoles, 2010. "The choice between fixed and random effects models: some considerations for educational research," DoQSS Working Papers 10-10, Department of Quantitative Social Science - Institute of Education, University of London.
- Clarke, Paul & Crawford, Claire & Steele, Fiona & Vignoles, Anna, 2010. "The Choice Between Fixed and Random Effects Models: Some Considerations for Educational Research," IZA Discussion Papers 5287, Institute for the Study of Labor (IZA).
- C52 - Mathematical and Quantitative Methods - - Econometric Modeling - - - Model Evaluation, Validation, and Selection
- I21 - Health, Education, and Welfare - - Education - - - Analysis of Education
This paper has been announced in the following NEP Reports:
- NEP-ALL-2010-08-06 (All new papers)
- NEP-EDU-2010-08-06 (Education)
- NEP-LAB-2010-08-06 (Labour Economics)
- NEP-URE-2010-08-06 (Urban & Real Estate Economics)
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