“Effective” vs “Ineffective” teachers don’t cause the ‘achievement gap’, Mathematica study shows

The Vergara decision was based on the idea that tenure laws made it so that poor students gor worse teachers and lowered those students’ scores. Not true, says this study.

Published in: on November 3, 2016 at 7:42 am  Comments (2)  

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  1. From the study report
    To measure teacher effectiveness, we used a value – added model, a statistical approach to isolate a teacher’s contribution to student achievement. It measures the achievement levels of a teacher’s students after accounting for students’ prior achievement levels and other characteristics, as well as the characteristics of other students in the classroom.

    Unless this is a better VAM than anything I have read about so far, the study seems to have been looking at randomly rated teachers so a random result would be expected. Or as the old CS line goes: GIGO!

    Until the researchers can demonstrate a valid measure of teacher effectiveness I’d call the research useless.


    • All true. The tremendously ironic point I think is that the most rigorous VAM measurement types out there essentially shows that the myth of the Super Teacher and Bad Union-protected Incompetent Teacher is bogus. Even by their own metrics.

      Sent from my iPhone



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