Month: January 2013 (page 2 of 2)

The magnitude of the BW gap with parental education in the NLSY97

I examine here the magnitude of the BW gap at different levels of parental education, using the NLSY97. You need to download a collection of variables in the NLS Investigator. The relevant ones for the present analysis are R1302400, R1302500, R1482600, R0538700, R0538600, and R9829600. You can check these variables using the “Variable Search” option in the NLS Investigator. And you may need a SPSS or PSPP program. In the SPSS (or PSPP) program, click on File, Open, and then Syntax, to upload the collection of variables you have downloaded from the NLS I (you should have transferred  your files into a new file located in your “Documents and Settings” folder). Recall that your handle file should look like this, or otherwise the recoding will not work.

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Greetings

Welcome to Human Varieties. My name is Jason, and I’ve inhabited the “Sailersphere” for some 12 years, mostly as a drive-by datamonkey and armchair theorist in comment sections. I can fairly be described as a hereditarian, and my Internet presence has loosely been fashioned around that paradigm and its allied disciplines. I used to contribute, however infrequently, to Razib Khan and Godless Capitalist’s Gene Expression group blog between 2003-2008, drawing the most attention with my review of Richard Lynn’s Race Differences in Intelligence, my discussion of cognitive ability and sexual behavior, and my defense of James D. Watson in 2007. The Watson post, in particular, had three interesting consequences. First, I was contacted and interviewed by earnest New York Times reporter, Amy Harmon. This interview was used for her DNA age article, which subsequently (and not unjustly) won the Pulitzer Prize. Second, I was invited to adapt my post into an editorial for the journal Medical Hypotheses by then Editor-in-Chief, Bruce Charlton. Most remarkably, though, I was called and thanked personally by the great man, James Watson himself! (The comical mismatch between my obscurity and Watson’s eminence, unfortunately, underscores the alarming ubiquity of his ill treatment during that whole manufactured scandal.) Watson even invited me to dine with him personally in early 2008; this was all the more flattering (and not a wee bit ironic) given that he had just published a book titled Avoid Boring People!

Since that time—an eternity in Internet years—John Fuerst has emerged as a much more meticulous and energetic hereditarian dilettante than I ever was or could be. However we have different things we can contribute to our overlapping interests and goals, and furthermore, we are not the only people who could use an active forum for exploring these issues in greater depth. So we started this website to assemble and nurture an online community of human diversity sleuths who can collaborate, respond to, and build off each other’s labor. Ideally, this site can serve as both an alternative to and a launching pad for standard published journal research.

If you have any questions or would like to join this blog as a contributor, please send me an email.

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Secular Changes in the Black-White Cognitive Ability Gap

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.

secularchanges1
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Fuzzy Wuzzy was a bear….

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:

generationxIQgapifSE
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IQs of US Immigrants in the NLSY97 (Whites, Blacks, Hispanics)

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.

IQ, Race, Nativity (NLSY97) Continue reading

100 years of Testing Negro Intelligence

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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