VAM-Based Bias


Turns out, it does exist!

By way of Audrey Amrein-Beardsley, we learn:

Overall, Deming failed to reject the hypothesis that school-level effects as measured using VAMs are unbiased, almost regardless of the VAM being used. In more straightforward terms, Deming found that school effects as measured using VAMs are often-to-always biased.

Read more about the study and what it means for the validity of VAM-based teacher evaluation.

It’s worth noting that Deming’s findings suggest that school-based effects can be accurate predictors of student achievement — which has important implications for teacher-based effects. That is, school-level factors may be accurate predictors while assigning effect to teachers is more tenuous.

More on VAM:

The Worst Teachers

Bias Confirmed

Value-Added Caution

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One Response to “VAM-Based Bias”

  1. Mark Taylor July 12, 2016 at 8:07 pm # Reply

    Lawsuit against VAM/TVASS was filed in Knox County Chancery court last month.

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