Seems like a pretty good example of wrong goals.https://twitter.com/DinaPomeranz/status/990715678192816130 …
Before-after studies find ~1 IQ gain, of doubtful real use (same review you get the implausible 5 IQ value from). Large RCT finds no lasting effect of Headstart etc. Meta-analysis confirms fade-out effect. etc.
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Many people in the world don't have access to good primary and secondary schools. This is not about IQ and not about Europe & the US.
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I actually think the age cutoff RD the most convincing method. Reasons why other methods would systematically underestimate effects. I'm aware of fade out on educational interventions but they're not comparing vs no education!
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