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Value-Added

  • What About Curriculum Effects?

    Written on August 19, 2010

    Our guest author today is Barak Rosenshine, emeritus professor of educational psychology at the University of Illinois at Urbana-Champaign.

    Bill Gates, the Los Angeles Times, and others have argued that teachers should be held accountable for the achievement of their students. This has led to heated debates over the validity and proper use of value added statistical measures. But no one seems to be talking about curriculum effects. What if an excellent teacher is in a school that has selected a curriculum for mathematics or for reading that isn’t very good. How accountable should the teacher be in those circumstances?

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  • Value-Added And Collateral Damage

    Written on July 29, 2010

    The idea that we should "fire bad teachers" has become the mantra of the day, as though anyone was seriously arguing that bad teachers should be kept. No one is. Instead, the real issue is, and has always been, identification.

    Those of us who follow the literature about value-added models (VAM) - the statistical models designed to isolate the unique effect of teachers on their students' test scores - hear a lot about their imprecision. But anyone listening to the public discourse on these methods, or, more frighteningly, making decisions on how to use them, might be completely unaware of the magnitude of that error.

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