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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
Hayes, Glenn Warren – 1966
A sample of 96 ninth-grade vocational agriculture students in 21 Illinois high schools participated in a study of the relationship between socioeconomic status and reading comprehension. An instructional unit was tested for reading level and rewritten at an easier level. Students were classified by socioeconomic class and randomly assigned to…
Descriptors: Agricultural Education, Comparative Analysis, Control Groups, Experimental Groups
