Florida Sen. Anitere Flores continues to advocate for the incomprehensible value-added system used to rate teachers, despite a litany of problems. First, the scores underlying the performance tiers are fraught with errors, because of the small number of included students, measurement error and other technical factors.
Second, the portion of school-performance scores to be added to the teachers’ scores was arbitrarily decided by a committee of non-statisticians, rather than empirically through an analysis of what the proportions should be. Last, the addition of end-of-course exams and hard-to-measure content will hardly make the system more fair.
Without pre-test scores or random assignment, teacher effectiveness will be based on students’ initial abilities regardless of the “value added” that is actually gained through instruction. Unless Rep. Flores would like her performance to be evaluated that way, she shouldn’t inflict such a process on others.
Steven M. Urdegar, Plantation