Skin tone and IQ among blacks: The General Social Survey recorded the skin tone of 495 black respondents from very light brown (1) to very dark brown (5). I calculated correlations between this measure and a number of variables:
Correlation with light skin tone
Years of education .17
Father's years of education .12
Mother's years of education .20
Spouse's years of education .13
All positive, but small. Then again, this is crude measure of genetic variation. Measurement error lowers the correlation. So I do take this as evidence that genes help explain the race-IQ link since whether the individual is light-skinned or dark, what white folks see is a black person. If whites determine black outcomes, there should be no correlation with skin tone.
I also wanted to see if blacks were lighter in the North as I had read before. Here are the means:
Mean lightness of skin
West North Central 3.00
East North Central 2.98
West South Central 2.83
Middle Atlantic 2.78
East South Central 2.73
South Atlantic 2.55
Blacks in the mid-Atlantic region do not have a high average, but those from Ohio to North Dakota do.
Glaucoma is a progressive condition caused by a combination of genetic and environmental factors and is the leading cause of irreversible bl...
In the comments in the last post , some readers contended that Jews are not ethnocentric. Using the same question I used in the comments se...
Via a reader at iSteve, it looks like this might be the vocabulary test used by the General Social Survey. (Someone please tell me if I'...
The National Couples Survey asked married people if they've had anal intercourse in the past four weeks. Here are their responses by ra...