To better understand the secular changes in the Black/White cognitive ability gap in the US, I plotted the standardized differences from our nearly 100 year review against row number. As samples were chronologically ordered, this provides a initial look at the relation between the magnitude of the gap and time.
Year: 2013 (Page 6 of 6)
GC maintains that the Hispanic-White IQ difference fails to converge by the fourth generation. If so, this would be informative as to the etiology of the differential. I articulated why in a previous post. IQ differences between families, within populations are poorly environmentally transmitted across generations. This is because the environmental correlation between parents and offspring is low. The situation is depicted below:
As a follow-up of Chuck’s previous post, here are the IQ scores for whites and non-whites, by nativity status, using the NLSY97.
It is not the purpose of this book to prove that Negroes are socially, morally, or intellectually inferior to whites; nor is its purpose to demonstrate that Negroes are the equal of or are superior to whites in these several characteristics. Rather, it is the intention of the writer to convey with some degree of clarity and order the results of many years of research on one aspect of Negro behavior and to assess objectively the ever growing literature on this subject. — Shuey (1966). The Testing of Negro Intelligence.
I felt unsatisfied with my last attempt so I decided to conduct a more complete review. This is my most recent version of TNI (Testing Negro Intelligence). I was able to cover every major sample prior to 1980 and nearly every major sample up until the 1990s. I included, along with a plethora of other studies, two major reviews and three meta-analyses. To this I added my own analysis of the publicly available NALS and NAAL and a mini-meta-analysis covering the years 2004 to 2012. This review is based on over 700 samples of which over 60 are nationally representative. It’s so large that it doesn’t fit on my screen — and perhaps yours too. As such, I attached my excel file for interested readers. (Excel File here.)
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