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ERIC Number: EJ900750
Record Type: Journal
Publication Date: 2010
Pages: 25
Abstractor: As Provided
Reference Count: 46
ISSN: ISSN-1934-5747
The Implications of Teacher Selection and the Teacher Effect in Individually Randomized Group Treatment Trials
Weiss, Michael J.
Journal of Research on Educational Effectiveness, v3 n4 p381-405 2010
In some experimental evaluations of classroom-level interventions it is not practically feasible to randomly assign teachers to experimental conditions. Given such restrictions, researchers may randomly assign students to experimental conditions and consider the teacher to be a part of the intervention. However, in an individually randomized evaluation of a classroom-level intervention, unless teachers are randomized to experimental conditions, it will not be clear whether differences in outcomes between program and control group students are a result of the core components of the intervention or the teachers (i.e., teacher effects). This article clarifies the correct interpretation of "program impacts" when this study design is used. In addition, using the magnitude of estimated teacher effects from past research, this article demonstrates that, if teachers are not randomly assigned to experimental conditions, it is difficult to establish whether the program works or whether the types of teachers selected to teach in program classrooms are simply more or less effective than their control group counterparts. The significant implications of the correct causal interpretation are discussed, and the limitations of this research design are explored. (Contains 2 figures, 2 tables and 8 footnotes.)
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Publication Type: Journal Articles; Reports - Descriptive
Education Level: Higher Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers - Location: New York