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Experimental Estimates of the Impacts of Class Size on Test Scores: Robustness and Heterogeneity

  • Ding, Weili
  • Lehrer, Steven F.

Proponents of class size reductions draw heavily on the results from Project STAR to support their initiatives. Adding to the political appeal of these initiative are reports that minority and economically disadvantaged students received the largest benefits from smaller classes. We extend this research in two directions. First, to address correlated outcomes from the same class size treatment, we account for the over-rejection of the Null hypotheses by using multiple inference procedures. Second, we conduct a more detailed examination of the heterogeneous impacts of class size reductions on measures of cognitive and noncognitive achievement using more flexible models. We find that students with higher test scores received greater benefits from class size reductions. Furthermore, we present evidence that the main effects of the small class treatment are robust to corrections for the multiple hypotheses being tested. However, these same corrections lead the differential impacts of smaller classes by race and freelunch status to become statistically insignificant.

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File URL: http://www.clsrn.econ.ubc.ca/workingpapers/CLSRN%20Working%20Paper%20no.%2077%20-%20Ding%20and%20Lehrer.pdf
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Paper provided by Vancouver School of Economics in its series CLSSRN working papers with number clsrn_admin-2011-12.

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Length: 38 pages
Date of creation: 26 Jun 2011
Date of revision: 26 Jun 2011
Handle: RePEc:ubc:clssrn:clsrn_admin-2011-12
Contact details of provider: Web page: http://www.clsrn.econ.ubc.ca/

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  12. Weili Ding & Steven F. Lehrer, 2010. "Estimating Treatment Effects from Contaminated Multiperiod Education Experiments: The Dynamic Impacts of Class Size Reductions," The Review of Economics and Statistics, MIT Press, vol. 92(1), pages 31-42, February.
  13. Weili Ding & Steven Lehrer, 2005. "Class Size and Student Achievement: Experimental Estimates of Who Benefits and Who Loses from Reductions," Working Papers 1046, Queen's University, Department of Economics.
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