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Download full textYu, Bing – Society for Research on Educational Effectiveness, 2013
Difference-in-differences (DID) strategies are particularly useful for evaluating policy effects in natural experiments in which, for example, a policy affects some schools and students but not others. However, the standard DID method may produce biased estimation of the policy effect if the confounding effect of concurrent events varies by…
Descriptors: Evaluation Methods, Bias, Research Methodology, Scores
