Category: Black-White IQ Gap (Page 7 of 7)

What happens if the Black-White IQ difference is entirely environmental in origin ? I argue here that we cannot be certain that the gap will disappear, and it is even possible that the gap would have increased if the between-group heritability (BGH) of IQ was lower than what it actually is.

Insofar as the socio-economic status (SES) is an index of cognitive stimulation, through wealth, culture, life style, parental expectations, parenting, and so on, it would be useful to examine the magnitude of the IQ gap at different levels of SES.
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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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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.

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