Goodhart's law
adage that when a measure becomes a target, it ceases to be a good measure
Episodes
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#5755: What Makes a School System "Best"?Korea tops the test scores, Finland skips the pressure. What are we actually measuring when we rank schools? -
#5161: How Statistics Get Misread: A Field GuideAverages, rates, correlations — the ten categories of statistics most likely to fool a general audience, and why the number is usually right.