News, data, and conversation about schools in New York City, including teacher ratings.
What is being measured in teacher ratings?
The ratings on this page reflect the city’s effort to isolate the effect of individual teachers on student performance. In this case, the measurement is based on math and English scores on New York State standardized tests. Each teacher was assigned an “expected” score based on the past performance and demographics of his or her students. This expected score is then compared to the students’ actual test results. The difference is considered the “value added” by the teacher.