Health Services Research (HSR) Methods
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Solomon Four Group Design

An experimental design in which subjects are randomly assigned to two study groups and two control groups. Pretest measures are used for one of the study groups, and one of the control groups. Following exposure of the study groups to the intervention or experiment, posttest measures are collected on all four groups.


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.