ERIC Number: ED506276
Record Type: Non-Journal
Publication Date: 2009-Aug
Reference Count: 0
Estimating Treatment Effects from Contaminated Multi-Period Education Experiments: The Dynamic Impacts of Class Size Reductions. NBER Working Paper No. 15200
Ding, Weili; Lehrer, Steven F.
National Bureau of Economic Research
This paper introduces an empirical strategy to estimate dynamic treatment effects in randomized trials that provide treatment in multiple stages and in which various noncompliance problems arise such as attrition and selective transitions between treatment and control groups. Our approach is applied to the highly influential four year randomized class size study, Project STAR. We find benefits from attending small class in all cognitive subject areas in kindergarten and the first grade. We do not find any statistically significant dynamic benefits from continuous treatment versus never attending small classes following grade one. Finally, statistical tests support accounting for both selective attrition and noncompliance with treatment assignment.
Descriptors: Control Groups, Class Size, Small Classes, Grade 1, Experimental Groups, Research Methodology, Research Problems, Kindergarten, Educational Benefits, Elementary School Students, Statistical Analysis, Educational Research, Attrition (Research Studies), Longitudinal Studies, Program Evaluation
National Bureau of Economic Research. 1050 Massachusetts Avenue, Cambridge, MA 02138-5398. Tel: 617-588-0343; Web site: http://www.nber.org/cgi-bin/get_bars.pl?bar=pub
Publication Type: Reports - Research
Education Level: Elementary Education; Elementary Secondary Education; Grade 1; Kindergarten
Authoring Institution: National Bureau of Economic Research