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December 31, 2012


Please don't ignore the two most important caveats regarding Chetty et al. First, they ignored qualitative research on the unofficial sorting in the district. Secondly, they excluded the 8% or so of classes where 25% on students are on IEPs. Clearly, they were unaware of how rare those levels are in low-poverty schools and how common they are in high-poverty schools, and why that exclusion was such a blow to their study's reliability.

Thanks, John, those are important notes.

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