Introduction to Difference in Differences (DID) Analysis
** Surveys generally relies on statistical methods, rather than research design, to control for threats to internal validity. *Difference-in Differences analysis ususally use data collected from this design Table 1. Comparisons of an Experiment, a Quasi-Experiment, and a Survey Nonequivalent Control Group Design* Yt1 X Yt2 -----Yc1 Yt2
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