Why did scores drop so dramatically at Wilson and Walls?

Friday, September 2, 2016

The release of PARCC (the annual test taken by DC public school students) scores showed small average increases in PARCC scores across most grades and subjects across the city, coupled with dramatic score drops at Wilson, and School Without Walls. Why the drops?

As I explain below, these scores cannot and should not be regarded as valid for concluding anything about achievement at either school. Validity requires that there is something constant, known, and relevant about the students taking the test this year and last. In the case of these two schools, these conditions are absent.

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