2014-Aug-19, 09:36:33

23: sp

46: sp

67: sp

95: sp

102: sp

122: sp

126: sp

137: sp

148: sp

158:

“Generally, the B/W and H/W mean score differences in these samples were somewhat smaller than those typically found in the national population at large.”

This would indicate that perhaps some of the lower tail blacks are missing from the studies, yes? If those lower tail blacks also have the worst environments, then this can bias the h^2 estimate upwards for blacks. I know you only have a few samples, but theoretically, you can test this using r(W-B h^2 x W-B IQ d). If the depression hypothesis is right, this should be negative.

Alternatively, perhaps the W-B d is just smaller now than it used to as claimed by some. Or not fully formed at these ages.

160: sp

216: sp

217: sp

264:

“Another assumption is that no assortative mating took place in the parental generation with respect to cognitive abilities.”

Is it possible to run the model with estimates of assortative mating?

Vandenberg, S. G. (1972). Assortative mating, or who marries whom?. Behavior genetics, 2(2-3), 127-157.

Cites some studies. Range is .44 to .60. Unweighted mean is 48.75. It seems foolish to conduct a study assuming a zero value for something that is known to be substantial. On the other hand, I'm not aware of any studies of assortative mating by race. If the strength of this is different, it should change the amount of genetic variance within race. This influences d's values.

272: sp

328: sp

339: sp

340: sp

359: sp

361: sp

421: sp

426: sp

433: sp

478: sp

46: sp

67: sp

95: sp

102: sp

122: sp

126: sp

137: sp

148: sp

158:

“Generally, the B/W and H/W mean score differences in these samples were somewhat smaller than those typically found in the national population at large.”

This would indicate that perhaps some of the lower tail blacks are missing from the studies, yes? If those lower tail blacks also have the worst environments, then this can bias the h^2 estimate upwards for blacks. I know you only have a few samples, but theoretically, you can test this using r(W-B h^2 x W-B IQ d). If the depression hypothesis is right, this should be negative.

Alternatively, perhaps the W-B d is just smaller now than it used to as claimed by some. Or not fully formed at these ages.

160: sp

216: sp

217: sp

264:

“Another assumption is that no assortative mating took place in the parental generation with respect to cognitive abilities.”

Is it possible to run the model with estimates of assortative mating?

Vandenberg, S. G. (1972). Assortative mating, or who marries whom?. Behavior genetics, 2(2-3), 127-157.

Cites some studies. Range is .44 to .60. Unweighted mean is 48.75. It seems foolish to conduct a study assuming a zero value for something that is known to be substantial. On the other hand, I'm not aware of any studies of assortative mating by race. If the strength of this is different, it should change the amount of genetic variance within race. This influences d's values.

272: sp

328: sp

339: sp

340: sp

359: sp

361: sp

421: sp

426: sp

433: sp

478: sp