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Direct linkWong, Manyee; Cook, Thomas D.; Steiner, Peter M. – Journal of Research on Educational Effectiveness, 2015
Some form of a short interrupted time series (ITS) is often used to evaluate state and national programs. An ITS design with a single treatment group assumes that the pretest functional form can be validly estimated and extrapolated into the postintervention period where it provides a valid counterfactual. This assumption is problematic. Ambiguous…
Descriptors: Evaluation Methods, Time, Federal Legislation, Educational Legislation
Peer reviewedPorkess, Roger – Teaching Statistics, 1996
This article examines some of the difficulties frequently encountered by students when analyzing bivariate data and suggests how they might be overcome. (Author)
Descriptors: Causal Models, Correlation, Misconceptions, Prediction
