you know i've mentioned this a couple of times already but has no one noticed that i deleted this section and integrated its contents into 'test scores' section imo it works much better this way and satisfies most people's concerns it that change sticks this conversation is moot that being said mike the phrase the magnitude of the regression across varying degrees of relatedness isn't quite on the mark what jensen did was show that not only does the iq gap exist in itself but that the populations regress towards the same differentiated means as found in the iq gap it basically reinforces the claim that the iq gap is a real effect now he and nesbitt argue over whether that regression is better explained by genetic or environmental theories and in fact jensen's structural equation model suggests that both genetics and environment play a role but that issue has not been decided yet ludwigs