Randomized Solomon Four-Group Experiment

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A Randomized Solomon Four-Group Experiment is a Randomized Control Group Pretest-Posttest Experiment for some portion of its subjects and a Randomized Control Group Posttest-only Experiment for the remainder.



References

2003

2008

  • (Clark & Shadish, 2008) ⇒ M. H. Clark, and William R. Shadish. (2008). “ Solomon Four-Group Design.” In: doi:10.4135/9781412963947
    • QUOTE: The Solomon four-group design is an experimental design that assesses the plausibility of pretest sensitization effects, that is, whether the mere act of taking a pretest influences scores on subsequent administrations of the test. For example, if respondents complete a questionnaire measuring their knowledge of science as a pretest, they might then decide to subsequently seek answers to a few unfamiliar equations. At the posttest they might then score better on the science test compared to how they would have scored without taking the pretest. Meta-analytic results suggest that pretest sensitization does occur, although it is more prevalent for some measures than others, and the more time passes between pretest and posttest, the less likely a testing effect will occur. In the Solomon four-group design, the researcher randomly assigns respondents to one of four cells constructed from two fully crossed factors: treatment (e.g. treatment and control) and pretest administration

2006

1969

  • (Solomon, 1969) ⇒ Richard L. Solomon. (1949). “An extension of control group design." Psychological Bulletin 46, no. 2 (1949): 137.
    • ABSTRACT: An extension or modification of the currently used control group design is presented. It is shown that the use of a 3-group design, and in some cases a 4-group design, has potentialities for demonstrating and weighting certain interaction effects. Examples are presented.