I've heard lots of "mainstream" sources claim large (~1 sigma!) differences in effectiveness between good and bad teachers on performance. Is this not true, or is it just that in practice there's not so much variance in teacher quality?
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I'm sure there are systematic large differences between teachers, but these evidently don't translate into notable effects on students.
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Did they assess teacher quality throughout both twin’s education? Unless one twin had zero teachers with any talent (I assume IQ would probably be a good proxy) then the conclusion drawn that school factors are not important is inconclusive at best.
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You don't need to measure these things with this research design.
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Doesn’t that presume that if a teacher had an effect that effect would stay local to the teacher’s subject matter? What if the talented teacher effect is found in the aggregate? Seems reasonable that students would encounter at least one talented teacher in their lifetime.
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Teacher here, with little delution about his impact. There might be some influence on group norms, eg is it ok to bully a classmate. In effect the whole social climate and emotional well-being might be an area of influence.
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