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Other studies seem to agree, usually a little to the lower end.For example, Goldhaber, Brewer, and Anderson (1999) find teachers explain 9% of variance; Nye, Konstantopoulos, and Hedges (2004) find they explain 13% of variance for math and 7% for reading.Even though these “school level effects” are supposed to be things like “the school is well-funded” or “the school has a great principal”, I worry that they’re capturing student effects by accident.

So for example if the test scores of two kids in the same teacher’s class were on average no more similar than the test scores of two kids in two different teachers’ classes, then teachers can’t matter very much.So one year with your fourth-grade teacher making you learn fractions has vast effects on your prospects, but twenty-odd years with your parents shaping you at every moment doesn’t? I decided to try to figure this out by looking into the research on teacher effectiveness more closely.First, how much do teachers matter compared to other things?Good schools and teachers may push that a little higher, and bad ones bring it a little lower, but they don’t work miracles.(remember that right now we’re talking about same-year standardized test scores.Together, these developments ensured the safety of fencing’s participants.Fencing was included for the first time at the 1896 Games in Athens, and has remained on the Olympic programme since then.But they all agree pretty well that individual factors are most important, followed by school and teacher factors of roughly equal size.Teacher factors explain somewhere between 5% and 20% of the variance.The Goldhaber study above tries its best, but the only school-level variable they can pin down is that having lots of white kids in your school improves test scores.And as far as I can tell, they don’t look at socioeconomic status of the school or its neighborhood, which is probably what the white kids are serving as a proxy for.

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