[Susan notes: This is a very important letter. Everyone--EVERYONE--should send a version of it to the Los Angeles Times.
To the editor
The LA Times ("Who's teaching LA kids?" August 15) is practicing educational research without a license, and is practicing it poorly. The value-added analysis of teacher quality used by the Times is based on test scores. It assumes that the test scores are valid, that teachers are randomly assigned to classes, and that the results for individual teachers are stable. None of these assumptions have been validated.
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