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Direct linkRobinson, Daniel H.; Levin, Joel R.; Thomas, Greg D.; Pituch, Keenan A.; Vaughn, Sharon – American Educational Research Journal, 2007
The authors examined the methodologies of articles in teaching-and-learning research journals, published in 1994 and in 2004, and classified them as either intervention (based on researcher-manipulated variables) or nonintervention. Consistent with the findings of Hsieh et al., intervention research articles declined from 45% in 1994 to 33% in…
Descriptors: Intervention, Incidence, Meta Analysis, Bibliometrics
