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Learning in primary > Class size (eLP) > Jepsen 2009

Detailed Information

Country	Country: United States
GDP per capita	44.518
Context details	Public elementary schools in California, except for charter schools and alternative schools (such as special education schools)
Age	Grades 2-4

2. Intervention

Implementation year	1997
Implementer	Government
Duration (months)	N/A
Cost	N/A
Intervention details	Class size reduction from 25 to 20 students (computed from the original estimate of reducing the class size from 30 to 20)

Evaluation design	Differences-in-differences
Cluster definition	School

Sample	Outcome	Test	Source Table	Observations	Statistics on Effects
Grade 4	Language	SAT	3	65511	Coeff: 0.35; t-statistic: 5.00
Grade 3	Language	SAT	3	65511	Coeff: 0.37; t-statistic: 5.93
Grade 4	Math	SAT	3	65511	Coeff: 0.56; t-statistic: 6.54
Grade 2	Language	SAT	3	65511	Coeff: 0.63; t-statistic: 4.76
Grade 2	Math	SAT	3	65511	Coeff: 0.72; t-statistic: 4.11
Grade 3	Math	SAT	3	65511	Coeff: 0.96; t-statistic: 11.45

Study	Jepsen, Christopher, and Steven Rivkin. "Class Size Reduction and Student Achievement: The Potential Tradeoff between Teacher Quality and Class Size." Journal of Human Resources 44, no. 1 (2009): 223-250.