How Long Do Teacher Effects Persist?

32 Pages Posted: 19 Jul 2007

See all articles by Spyros Konstantopoulos

Spyros Konstantopoulos

Boston College; IZA Institute of Labor Economics

Date Written: June 2007


Previous findings from experimental and non-experimental studies have demonstrated that teachers differ in their effectiveness. In addition, evidence from non-experimental studies has indicated that teacher effects can last up to five years. This study used high-quality data from a four-year randomized experiment in which teachers and students were randomly assigned to classes to examine whether teacher effects on student achievement persist over time. Teacher effects are defined as teacher specific residuals adjusted for student and treatment effects. Findings indicate that the teacher effects are cumulative and observed not only in the current or the following grade, but they endure up to three years in early elementary grades. The findings also suggest that teacher effects are important and their additive effects on student achievement are as large as the additive effects of small classes. Finally, teacher effects are larger in reading than in mathematics.

Keywords: teacher effects, experimental data, multi-level models

JEL Classification: I2

Suggested Citation

Konstantopoulos, Spyros, How Long Do Teacher Effects Persist? (June 2007). IZA Discussion Paper No. 2893, Available at SSRN:

Spyros Konstantopoulos (Contact Author)

Boston College ( email )

140 Commonwealth Avenue
Chestnut Hill, MA 02467
United States

IZA Institute of Labor Economics

P.O. Box 7240
Bonn, D-53072

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