Well, the identical twin parts of the study would automatically control for height and sex :)
What?
I meant, it doesn’t surprise me at all that if you pick a bunch of pairs of twins, the correlation between “x’s weight” and “x’s twin’s weight” would be very large—but if you only picked pairs of male twins between 1.77 m and 1.80 m tall and you got the same result...
What?
I meant, it doesn’t surprise me at all that if you pick a bunch of pairs of twins, the correlation between “x’s weight” and “x’s twin’s weight” would be very large—but if you only picked pairs of male twins between 1.77 m and 1.80 m tall and you got the same result...