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Experimental Estimates of Education Production Functions


Alan B. Krueger


Princeton University - Industrial Relations Section; National Bureau of Economic Research (NBER); Institute for the Study of Labor (IZA)

May 1997

Industrial Relations Section Working Paper # 379

Abstract:     
This paper analyzes data from Project STAR, an experiment in which 11,600 Tennessee kindergarten students and teachers were randomly assigned to one of three types of classes beginning in the 1985-86 school year: small classes (13-17 students), regular-size classes (22-25 students), and regular-size classes with a teacher?s aide. According to the original design, students were to remain in their initial class type through the third grade. In practice, however, students in regular-size classes were randomly re-assigned at the end of kindergarten, and about 10 percent of students moved between class types in second and third grade. Attrition was also common. Several statistical methods are used to investigate the impact of these limitations. The main conclusions are: (1) on average, performance on standardized tests increase by about 4 percentile points the first year students are assigned to a small class, irrespective of the grade in which the student first attends a small class; (2) after initial assignment to a small class, student performance increases by about one percentile point per year relative to those in regular-size classes; (3) teacher aides have little effect on student achievement; (4) class size has a larger effect on test scores for minority students and for those on free lunch; (5) the beneficial effect of smaller classes does not appear to result from Hawthorne effects.

JEL Classification: I 21

working papers series





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Date posted: November 13, 1997  

Suggested Citation

Krueger, Alan B., Experimental Estimates of Education Production Functions (May 1997). Industrial Relations Section Working Paper # 379. Available at SSRN: http://ssrn.com/abstract=19779

Contact Information

Alan B. Krueger
Princeton University - Industrial Relations Section ( email )
Princeton, NJ 08544-2098
United States
609-258-4046 (Phone)
609-258-2907 (Fax)
National Bureau of Economic Research (NBER)
1050 Massachusetts Avenue
Cambridge, MA 02138
United States
Institute for the Study of Labor (IZA)
P.O. Box 7240
Bonn, D-53072
Germany
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