Most value-added impact from teachers fades within 1 year
The impact a specific schoolteacher has on students' math and reading scores – whether bad or good – fades quite fast, according to a new study by researchers at Brigham Young University and the University of Michigan.
A recent trend in public education is to measure teacher quality based on how the students fared on standardized tests compared to previous years. If most of Mr. Green's current 5th grade students score at a higher percentile than they did as 4th graders, then Mr. Green gets what's called a high "value-added" rating.
In August, The Los Angeles Times shined ...

