Classical twin studies were always touted as accurate by behavioral geneticists. Then when Extended family designs were invented by them, suddenly CTD's became "unreliable". I wonder whether the same will happen to ETFD's in a few years/decades
@LilTop00362891 CTD is unable to prove or disprove the effects of the shared environment. Adoption finds c for almost all outcomes(IQ, income included). https://t.co/vxlImn9ImM https://t.co/MX6HdVXxRN
RT @workercommie: https://t.co/KPnlxCV66W "Thus, if one’s interest is in characterizing the effects of the environment in any way—including…
https://t.co/KPnlxCV66W "Thus, if one’s interest is in characterizing the effects of the environment in any way—including arguing that shared environmental effects are small—the CTD is a singularly bad method" https://t.co/9xg4JtlmNx
@saarw Different methods with different sets of assumptions and statistical issues (just like any other model). Twin studies are robust. See e.g., https://t.co/6egoMJAlFs and https://t.co/OwauRBNVuW