Link to paper – papers.ssrn.com/sol3/papers.cfm?abstract_id=4965616
Tag: randomness
[YouTube] MINI LECTURE 15 – Conditional vs. unconditional correlation: twin studies overestimate heredity
The genetics of twin studies have a bias showing more heredity than in reality, owing to a statistical artifact. The twin studies for heredity are based on comparing the correlation between 2 identical twins minus that between 2 fraternal ones (assumed to be sharing half their genes). The use of fraternal twins as control is assumed to extract the “environmental” factors. Problem: Correlation is conditional and psychologists think it is unconditional. We show how the math is entirely different. The core error is that genes and environment are not separable and additive.