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Direct linkSt.Clair, Travis; Cook, Thomas D.; Hallberg, Kelly – American Journal of Evaluation, 2014
Although evaluators often use an interrupted time series (ITS) design to test hypotheses about program effects, there are few empirical tests of the design's validity. We take a randomized experiment on an educational topic and compare its effects to those from a comparative ITS (CITS) design that uses the same treatment group as the experiment…
Descriptors: Time, Evaluation Methods, Measurement Techniques, Research Design
