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"IQ heritability"

10 Comments -

1 – 10 of 10
Anonymous Anonymous said...

You will find few comments here because this is not material for griping.

7/31/11, 8:24 PM

Anonymous Anonymous said...

Any ideas why the anomaly in the UK correlation?
Gilbert P.

7/31/11, 9:13 PM

Anonymous Shanghai Ty said...

Just checking: MZ is for identical twins and DZ for fraternal?

7/31/11, 11:50 PM

Anonymous TH said...

Any ideas why the anomaly in the UK correlation?
Gilbert P
.

I don't think there's an anomaly. Heritability increases with age, while the effects of shared environment wane with age. The mean age in the UK sample is 11.57 years (range=10.08–13.74), which is lower than in the other samples, except for the Ohio one. The Ohio sample has a mean age of 6.07 years (range = 4.33–7.92), which means that the shared environmental effects are still strong.

Falconer's formula gives the following broad-sense heritabilities for the samples (mean ages and age ranges in parentheses):

Ohio: 42% (mean=6.07; range=4.33–7.92)

UK: 48% (mean=11.57; range=10.08–13.74)

Minnesota: 52% (mean=13; range=11–17)

Colorado: 58% (mean=13.12; range=6–25)

Australia: 70% (mean=16.00; range=15–22)

Netherlands: 50% (mean=17.99; range=5.67–71.03)

The paper in question can be read here; it is precisely about the linear increase of the heritability of IQ with age.

The results for g have not yet been published, but rumor has it that they also support earlier estimates such as those given above.

Anti-hereditarians have fought a rearguard action against hereditarianism for many decades. Each new study has made their blank slatism more and more absurd. All they really have left now are some feeble technical criticisms of the twin method, but if and when heritability studies that do not depend on twins produce results similar to twin studies, they'll have nothing.

8/1/11, 5:36 AM

Anonymous dearieme said...

"Any ideas why the anomaly in the UK correlation?"


Drink?

8/1/11, 6:14 AM

Blogger Dutch Boy said...

The great search for the IQ gene will be as fruitless as the great search for disease genes. IQ is indeed heritable but there will be no simple genetic pattern to reveal just how it is inherited:
http://independentsciencenews.org/health/the-great-dna-data-deficit/

8/1/11, 8:45 AM

Anonymous Analytical said...

Yes.

MZ = monozygotic (identical)
DZ = dizygotic (fraternal)

8/1/11, 9:02 AM

Anonymous Anonymous said...

"All they really have left now are some feeble technical criticisms of the twin method, but if and when heritability studies that do not depend on twins produce results similar to twin studies, they'll have nothing."

That is one of the reasons this new technique is important. I doubt the blank slaters will understand it well enough to mount much of a response. They'll just ignore it as long as they can.

@Dutch Boy: I suggest you read the Visscher paper on "missing heritability" and height. It is linked to from the original Hsu post.

8/1/11, 12:06 PM

Anonymous Anonymous said...

TH, thanks, very interesting.
G.P.

8/1/11, 6:00 PM

Anonymous Anonymous said...

Dearieme, Ha! But even chavs don't pile into the lager at age 11, do they?

G.P.

8/1/11, 6:02 PM

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