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smoofra comments on g, a Statistical Myth - Less Wrong
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One thing Dalliard mentions is that the 'g' derived from different studies are 'statistically indistinguishable'. What's the technical content of this statement?
There is a test to see how similar two factors are. When that test gives results in the >.95 area, the factors are usually taken to be indistinguishable. It's called congruence coefficients. See e.g. Jensen, Arthur R., and Li-Jen Weng. "What is a good g?." Intelligence 18.3 (1994): 231-258.