Fair, but pointing out that 10% *max* of exam score variance is attributable to diffs between schools is holding a sacred cow at gunpoint.https://twitter.com/toadmeister/status/924241137845587969 …
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People balk at ideas that Must Not Be Right to prop up institutions that Surely Must Work. It's fragile, so defections can't be entertained.
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No great conspiracy is required. Just a stable status quo, tremendous sunk costs & good people who need to believe they're doing good work.
