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Hulleman, Chris S.; Cordray, David S. – Society for Research on Educational Effectiveness, 2010
This paper outlines a method of determining the achieved relative strength (ARS) of an intervention by calculating the extent to which core intervention components are present in both the treatment and control condition. Using data from several examples the authors demonstrate how to calculate ARS indices, and subsequently how to incorporate them…
Descriptors: Intervention, Reading Instruction, Sample Size, Data Collection