Value-Added to What? How a Ceiling in the Testing Instrument Influences Value-Added Estimation
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.
|Date of creation:||15 Jun 2008|
|Date of revision:|
|Publication status:||published in Education Finance and Policy 2010|
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