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Hvordan finder man gode instrumentvariable?

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Klassestørrelse<br />

Et berømt eksempel er Angrist & Lavy (1999, QJE), der brugte<br />

Maimonides’ regel som naturligt eksperiment for klassestørrelse<br />

i Israel<br />

Klassestørrelse: 40<br />

Klassestørrelse: 41 20,5

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