.2 correlation between genes associated with autism and both education and IQ, both of which correlate much less than perfectly with one another. Likewise US Ashkenazim have elevated mean education and IQ by about 1SD.https://twitter.com/mmt_lvt/status/1194903160487383040 …
It's possible to have positive correlation between X and Z, positive between Y and Z, and then negative correlation between X and Y. Consider points randomly distributed 0<X<2, 0<Y<2, 1<X+Y=Z<3.
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Random uniform distribution, that is
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