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International Journal of Epidemiology 2001;30:1341-1342
© International Epidemiological Association 2001

Theory and Methods

Commentary: Are piecewise mixed effects models useful in epidemiology?

Rebecca Hardy

MRC National Survey of Health and Development, Department of Epidemiology and Public Health, Royal Free & University College Medical School, 1–19 Torrington Place, London WC1E 6BT, UK. E-mail: rebecca.hardy@ucl.ac.uk

The call for applied researchers to learn how to use mixed effects models in the paper by Naumova, Must and Laird1 in this issue of the International Journal of Epidemiology is to be welcomed. The value of longitudinal studies, in which measurements on the same sample of individuals are taken repeatedly over time, is well understood. Such studies are costly, both financially and in terms of the time and effort required on behalf of study members and researchers. Correct analysis of the often vast amount of data collected is therefore vital. Despite considerable discussion regarding the analysis of repeated measures in the statistics . . . [Full Text of this Article]

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