A system used to rate schools in Los Angeles and some other districts across the country may be overlooking important data that could make the ratings more meaningful. The Academic Performance Index has been shown to mirror students' advantages and disadvantages outside of school, rather than any progress the school is fostering. "We're measuring who is in schools rather than how effective the schools are," a Duke University testing expert said. Some say student progress may be better measured by value-added methods that look at individual students' performance from year to year.
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