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We could look at other similar reports to acquire a larger evidence base. From my reading of similar data they are pretty stable when it comes to group achievement from year to year. And, given everything else we know, I am not inclined to give Chisala's views much credence. 2/
With Jensen, he had to make the arguments of the critics rigorous only then to test them, usually just by citing some literature that critics didn't know about or ignored. Environmentalists are very lazy in general. They can be because they don't face much criticism.
Re. Chisala, did you see my paper on his video game claims? It's a typical example of hereditarian doing a proper test of claim made by environmentalist.
https://osf.io/7xpeh/files
See also comments by @akarlin88https://www.unz.com/akarlin/unscrabbled/ …
You are quite right that I ought to make a systematic attempt to address Chisala's claims. One dataset from one year isn't everything. I will endeavour to do so on my blog and contact Ron Unz.
I did indeed see your paper - it was very well done!
Did you see PISA scores?https://twitter.com/KirkegaardEmil/status/806377040429613056 …
Indeed. The difference in gaps is interesting, although in the Welsh case "the number of learners in this group [Black] is very small (n=11) and therefore these findings, although significant, should be interpreted with caution."
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