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Reducing Threats to Validity by Design in a Nonrandomized Experiment of a School-Wide Prevention Model
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Sørlie, Mari-Anne; Ogden, Terje – International Journal of School & Educational Psychology, 2014
This paper reviews literature on the rationale, challenges, and recommendations for choosing a nonequivalent comparison (NEC) group design when evaluating intervention effects. After reviewing frequently addressed threats to validity, the paper describes recommendations for strengthening the research design and how the recommendations were…
Descriptors: Validity, Research Design, Experiments, Prevention