Teachers, poverty and value added ratings
From the Hechinger Report: In Washington, D.C., one of the first places in the country to use value-added teacher ratings to fire teachers, teacher-union president Nathan Saunders likes to point to the following statistic as proof that the ratings are flawed: Ward 8, one of the poorest areas of the city, has only 5 percent of the teachers defined as effective under the new evaluation system known as IMPACT, but more than a quarter of the ineffective ones. Ward 3, encompassing some of the city’s more affluent neighborhoods, has nearly a quarter of the best teachers, but only 8 percent of the worst.
The discrepancy highlights an ongoing debate about the value-added test scores that an increasing number of states—soon to include Florida—are using to evaluate teachers. Are the best, most experienced D.C. teachers concentrated in the wealthiest schools, while the worst are concentrated in the poorest schools? Or does the statistical model ignore the possibility that it’s more difficult to teach a room full of impoverished children?