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Health Services Research (HSR) Methods
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Longitudinal Study
Synonyms: Panel Data Study; Longitudinal Analysis; Longitudinal Study

Studies that conduct two or more repeated measurements per subject in a group of subjects over two or more time periods.

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Further Reading
Last, J. 1983. A Dictionary of Epidemiology, New York, NY: Oxford Medical Publications.

Marczyk, G.R. et al. 2005. Essentials of Research Design and Methodology, Hoboken, NJ: John Wiley & Sons.

Gliner, J.A. and G.A. Morgan. 2000. Research Methods in Applied Settings, Mahwah, NJ: Lawrence Erlbaum Associates.

Campbell, D. and J. Stanley. 1963. Experimental and Quasi-Experimental Designs for Research, Boston, MA: Houghton Mifflin Company.