Audrey Amrein Beardsley: How Much Do Teachers Affect the Increase in Their Students’ Height?

Diane Ravitch's blog

Audrey Amrein Beardsley is one of the leading experts in the nation in the field of value-added assessment and also one of the nation’s leading skeptics of the claim that teacher “effectiveness” can be measured by the test scores of their students.

Recently, a study was published by economists that purported to measure the effect of teachers’ on their students’ height. The study was a blatant lampoon of VAM (value-added modeling or measurement).

It turns out that I was one of about 25 people who promptly forwarded it to Amrein-Beardsley.

She reviewed the study here. 

Beardsley reminds us of a paper written by economist Jesse Rothstein nearly a decade ago in which he lacerated VAM by showing that it could be twisted to show the effect of teachers on students’ past achievement, a feat that is clearly absurd.

When a policy idea like VAM becomes the target of satire, you…

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