Abstract
In the health and social sciences, longitudinal data have often been analyzed without taking into account the dependence between observations of the same subject. Furthermore, consideration is rarely given to the fact that longitudinal data may come from a non-normal distribution. In addition to describing the aims and types of longitudinal designs this paper presents three approaches based on generalized estimating equations that do take into account the lack of independence in data, as well as the type of distribution. These approaches are the marginal model (population-average model), the random effects model (subject-specific model), and the transition model (Markov model or auto-correlation model). Finally, these models are applied to empirical data by means of specific procedures included in SAS, namely GENMOD, MIXED, and GLIMMIX.
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Acknowledgments
This research was supported by grant PSI2012-32662 from the Spanish Ministry of Economy and Competitiveness. The authors are grateful to the Centre for Longitudinal Studies (CLS), Institute of Education, University of London, for the use of these data, and also to the UK Data Archive and Economic and Social Data Service (ESDS) for making them available. However, neither CLS nor ESDS bear any responsibility for the analysis or interpretation of these data.
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Arnau, J., Bono, R., Bendayan, R. et al. Analyzing longitudinal data and use of the generalized linear model in health and social sciences. Qual Quant 50, 693–707 (2016). https://doi.org/10.1007/s11135-015-0171-7
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DOI: https://doi.org/10.1007/s11135-015-0171-7