Tag Archives: TVAAS

Court Rules Against Flawed VAM Model

A Texas court has ruled against the use of value-added modeling in teacher evaluation saying the system used violates due process. Texas now joins New York as states where courts have found value-added systems used for teacher evaluation simply don’t stand up to scrutiny. Here’s more on the Texas case: Judge Stephen Smith of the […]

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A New Director and some VAM Bias

Last week, Metro Nashville Public Schools hired a new Director, Shawn Joseph. Also, some careful analysis of a recent study by the Tennessee Department of Education on “effective teaching” reveals some bias in the way the state’s value-added scores are distributed. Specifically: The study used TVAAS scores alone to determine a student’s access to “effective […]

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Unreliable and Invalid

Testing experts have for years now been warning school reformers that efforts to evaluate teachers using VAM are not reliable or valid. This from yet another story about problems with value-added modeling, or VAM. The story details the case of a New York teacher who is suing the state because evaluation results there, based on […]

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Struggles with Value-Added Modeling

Over at Bluff City Ed, John Alfuth has a post from a teacher’s perspective on value-added modeling. What’s interesting is that Alfuth study public policy and identifies himself as a supporter of using VAM. That is, before he became a practicing teacher. Now, it seems safe to say that while he still supports some uses […]

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Ravitch Cites Spears on Value-Added

Education historian and author Diane Ravitch cited an article I wrote for Tennessee Education Report on the lack of evidence that value-added data helps improve education outcomes. I’ve written on this topic several times, including noting the shortcomings of value-added data and the inability of value-added data to effectively differentiate among teachers. For more on education […]

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The Pitfalls of Value-Added Data

A version of this post first appeared in Tennessee Education Report. Valerie Strauss has an interesting piece over at the Washington Post dealing with Value-Added Modeling.  More specifically, the post analyzes what can be learned from 20 years of the Tennessee Value-Added Assessment System (TVAAS) implemented as a result of the Education Improvement Act — the […]

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