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Download full textHong, Guanglei – Society for Research on Educational Effectiveness, 2013
When using time series accountability data to evaluate system-wide education policies, concurrent changes often pose threats to internal validity. The standard difference-in-differences (DID) method resorts to a non-equivalent comparison group whose average outcome change is due to such confounding. This strategy relies on the strong assumption…
Descriptors: Accountability, Scores, Comparative Analysis, Algebra
