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If the effect were present, and as large as implied, you’d expect low IQ test results in ultra-polluted Chinese cities such as Shanghai and Beijing. And yet... http://www.city-data.com/forum/world/2348902-china-iq-map-pr...
Pardon my ignorance, but how is this IQ data obtained? It is reported by the government? Are IQ tests standardized?
If the effect were present, and as large as implied, you’d expect low IQ test results in ultra-polluted Chinese cities such as Shanghai and Beijing. And yet... http://www.city-data.com/forum/world/2348902-china-iq-map-pr...
The people living in those cities form a so-called "self-selecting" sample. They are probably, on average better educated, and they recognize the value of education much better. They already would score higher than the others, that's why they moved to the city.
It might just as well be that the same people would score far higher in a non-polluted city.
This is blogspam. Here's the original post: https://patrickcollison.com/pollution
1. https://dash.harvard.edu/bitstream/handle/1/27662232/4892924...
Earlier quoted context omitted.
Pardon my ignorance, but how is this IQ data obtained? It is reported by the government? Are IQ tests standardized?
>IQ tests standardized? IQ tests can't be standardized across cultures. Even something like Raven's Progressive Matrices has a cultural component. https://www.apa.org/monitor/feb03/intelligence Also China has some issues with the way they report scholastic achievement that make their results appear higher than they should. China is very selective about which students take standardized tests that are used for global c…
The median IQ should be 100, with a standard deviation of 15.
If the median IQ is not 100 over the population, the test is flawed.
Earlier quoted context omitted.
>IQ tests standardized? IQ tests can't be standardized across cultures. Even something like Raven's Progressive Matrices has a cultural component. https://www.apa.org/monitor/feb03/intelligence Also China has some issues with the way they report scholastic achievement that make their results appear higher than they should. China is very selective about which students take standardized tests that are used for global c…
Seems hilarious to assume they can be standardized within a culture too, whatever a culture may be.
not sure where hilarity comes into play ... it has well defined statistical properties
perhaps you mean that the results of IQ tests can be, and often are grossly misinterpreted, that is not related to standardization
Earlier quoted context omitted.
Pardon my ignorance, but how is this IQ data obtained? It is reported by the government? Are IQ tests standardized?
>IQ tests standardized? IQ tests can't be standardized across cultures. Even something like Raven's Progressive Matrices has a cultural component. https://www.apa.org/monitor/feb03/intelligence Also China has some issues with the way they report scholastic achievement that make their results appear higher than they should. China is very selective about which students take standardized tests that are used for global c…