-  Enable investigators to better speculate about time-order relationships among factors that vary together
-  Help reduce the third-variable problem that so often arises in correctional studies

University of Michigan - Ann Arbor

 A longitudinal design follows the same subjects over time. 

Longitudinal Studies 

Trull , T. J., &amp; Prinstein , M. J. (2013). Research Methods in Clinical Psychology . In Clinical Psychology (Eighth, pp. 93–124). Textbook, Wadsworth Cengage Learning . 

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