Every Teacher in the U.S. Should Post This Statement in His or Her Classroom

Diane Ravitch's blog

This is the executive summary of the statement of the American Statistical Association on the use of value-added assessment to evaluate teachers. Please share it with other teachers, with principals, and school board members. Please share it with your legislators and other elected officials. Send it to your local news outlets. The words are clear: Teachers account for between 1 and 14% of the variation in test scores. And this is very important to remember: “Ranking teachers by their VAM scores can have unintended consequences that reduce quality.”

ASA Statement onUsing Value-Added Models for Educational Assessment

April 8, 2014

Executive Summary

Many states and school districts have adopted Value-Added Models (VAMs) as part of educational accountability systems. The goal of these models, which are also referred to as Value-Added Assessment (VAA) Models, is to estimate effects of individual teachers or schools on student achievement while accounting for differences…

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