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Value-Added to What? How a Ceiling in the Testing Instrument Influences Value-Added Estimation

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Author Info
Cory Koedel () (Department of Economics, University of Missouri-Columbia)
Julian Betts

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Abstract

Value-added measures of teacher quality may be sensitive to the quantitative properties of the testing instruments upon which they are based. This paper focuses on the sensitivity of value-added to a particularly relevant testing-instrument property test-score-ceiling effects. Test-score ceilings are likely to be increasingly common in testing instruments across the country as education policy continues to emphasize proficiency-based reform. Encouragingly, we show that over a wide range of test-score- ceiling severity, teachers value-added estimates are only negligibly influenced by ceiling effects. However, as ceiling conditions approach those found in minimum-competency testing environments, value-added results are significantly altered.

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File URL: http://economics.missouri.edu/working-papers/2008/wp0807_koedel.pdf
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Publisher Info
Paper provided by Department of Economics, University of Missouri in its series Working Papers with number 0807.

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Length: 53 pgs.
Date of creation: 15 Jun 2008
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Handle: RePEc:umc:wpaper:0807

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Related research
Keywords: Value Added; Test Score Ceiling; Ceiling Effects; Teacher Quality; Teacher Value Added;

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Find related papers by JEL classification:
I20 - Health, Education, and Welfare - - Education - - - General
I21 - Health, Education, and Welfare - - Education - - - Analysis of Education
J24 - Labor and Demographic Economics - - Demand and Supply of Labor - - - Human Capital; Skills; Occupational Choice; Labor Productivity

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References listed on IDEAS
Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
  1. Charles Brown & Robert Moffitt, 1983. "The Effect of Ignoring Heteroscedasticity on Estimates of the Tobit Model," NBER Technical Working Papers 0027, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
  2. Arabmazar, Abbas & Schmidt, Peter, 1981. "Further evidence on the robustness of the Tobit estimator to heteroskedasticity," Journal of Econometrics, Elsevier, vol. 17(2), pages 253-258, November. [Downloadable!] (restricted)
  3. Daniel Aaronson & Lisa Barrow & William Sander, 2007. "Teachers and Student Achievement in the Chicago Public High Schools," Journal of Labor Economics, University of Chicago Press, vol. 25, pages 95-135. [Downloadable!]
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  4. Jnah E. Rockoff, 2004. "The Impact of Individual Teachers on Student Achievement: Evidence from Panel Data," American Economic Review, American Economic Association, vol. 94(2), pages 247-252, May. [Downloadable!]
  5. Gorgens, Tue & Horowitz, Joel L., 1999. "Semiparametric estimation of a censored regression model with an unknown transformation of the dependent variable," Journal of Econometrics, Elsevier, vol. 90(2), pages 155-191, June. [Downloadable!] (restricted)
    Other versions:
  6. Thomas J. Kane & Douglas O. Staiger, 2002. "The Promise and Pitfalls of Using Imprecise School Accountability Measures," Journal of Economic Perspectives, American Economic Association, vol. 16(4), pages 91-114, Fall. [Downloadable!] (restricted)
  7. Richard T. Carson & Yixiao Sun, 2007. "The Tobit model with a non-zero threshold," Econometrics Journal, Royal Economic Society, vol. 10(3), pages 488-502, November. [Downloadable!] (restricted)
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Cited by:
(explanations, Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.)

  1. Cory Koedel, 2008. "An Empirical Analysis of Teacher Spillover Effects in Secondary School," Working Papers 0808, Department of Economics, University of Missouri. [Downloadable!]
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