American Statistical Association Statement on Value-Added Models
Use of VAM for Educational Assessment
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 in student background. VAMs are increasingly promoted or mandated as a component in high-stakes decisions such as determining
compensation, evaluating and ranking teachers, hiring or dismissing teachers, awarding tenure, and closing schools.
As the largest organization in the United States representing
statisticians and related professionals, the American Statistical
Association (ASA) is making this statement to provide guidance,
given current knowledge and experience, a
s to what can and cannot reasonably be expected from the use of VAMs.