Reply to Why is Washington Latin MS now a Tier 2 school?

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[quote=Anonymous]I think that using median growth percentile instead of raw test scores is both a good and flawed measure. This is the best explanation I've found of it and includes a (dated) comparison of DCPS and DCPCS: http://www.urban.org/urban-wire/how-good-are-dcs-schools

If there is more recent DCPS data, I'd love to see it.

Succinct version:
A typical school will have a median growth percentile of 50, while 70 means a school is doing substantially better than a typical school and 30 means a school is doing substantially worse. So we can say one school is better than another if its MGP is higher, meaning that at least the typical growth level is higher at one school than the other (it could still be the case that the lower-ranked school serves a specific subgroup much better than the higher-ranked school).

The main problem is that these scores are fraught with measurement error, so rarely can we say with confidence that one school is better than another school. For example, Bancroft was in the top third on math MGP for 2011-12 and H.D. Cooke was in the bottom third, but the two math MGP scores are statistically indistinguishable (their scores’ margins of error overlap).
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