Published Online: 30 JAN 2010
Copyright © 2010 John Wiley & Sons, Inc. All rights reserved.
Corsini Encyclopedia of Psychology
How to Cite
Shadish, W. R. and Galindo, R. 2010. Quasi-Experimental Design. Corsini Encyclopedia of Psychology. 1–2.
- Published Online: 30 JAN 2010
Like all experiments, quasi-experiments manipulate treatments to determine their effects. Quasi-experiments differ from randomized experiments in that units are not randomly assigned to conditions. Instead, units are assigned to conditions using such nonrandomized ways as permitting units to choose conditions or assigning them based on presumed need or merit. Lacking random assignment, quasi-experiments may not yield unbiased estimates, threatening the validity of inferences about treatment effects.
- regression discontinuity design;
- interrupted time series;
- propensity score analysis