Health Services Research (HSR) Methods
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Reversal Time Series

A study design in which an intervention is introduced and withdrawn one to several times while the outcome of interest is measured repeatedly over time. A series of pretests is generally conducted to generate a baseline, after which the intervention is introduced and the outcome of interest is measured several times. The intervention is then withdrawn, and the outcome is measured several times. This process may be repeated as many times as desired.

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

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

Shi, L. 1997. Health Service Research Methods, Albany, NY: Delmar Publishers.