The point of the new lit on preschool is its long-lasting, highly cost-beneficial effects on personality rather than cognitive skills. The weakness of that lit: are the high-quality preschool programs scaleable?
n = 3,131 randomized trial of early intervention program finds that ... (drum roll) ... early gains when then dissipated and might have slight negative effect at third grade scholastic achievement. #JensenWasRight http://www.straighttalkonevidence.org/2018/07/16/large-randomized-controlled-trial-finds-state-pre-k-program-has-adverse-effects-on-academic-achievement/ …pic.twitter.com/hbKiGH9udI
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Seems like just citation bias to me. These people keep reanalyzing Perry Preschool etc. known to be extreme outliers in the literature.https://twitter.com/KirkegaardEmil/status/849992441658826752 …
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Do you see any reason to believe the effect is really negative or is this just noise around the real value of zero?
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I'd guess fluke, but a negative small effect has been found previously in a recent study. It was about math achievement, but I can't find it right now.
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