Changes over time in the black–white difference on mental tests: Evidence from the children of the 1979 cohort of the National Longitudinal Survey of Youth

"Intelligence: New findings and theoretical developments": Correction to Nisbett et al. (2012).

“…A major objection of Rushton and Jensen was that Dickens and Flynn failed to analyze the standardization sample of the Woodcock-Johnson III IQ test. Murray (2006) did that analysis and found Black gains of a magnitude similar to those found by Dickens and Flynn on the four other tests, though the gains on the Woodcock-Johnson test came at an earlier time period than those on the other tests.…”

The magnitude and components of change in the black–white IQ difference from 1920 to 1991: A birth cohort analysis of the Woodcock–Johnson standardizations

“…The B-W difference on the Peabody reading recognition, reading, mathematics, and picture vocabulary tests increased slightly for the children of women in the NSLY-79 cohort born from the mid-1970s through the mid-1990s (Murray, 2006).…”

“…These findings are apparently inconsistent with Murray (2006), which employs a birth cohort analysis of test scores among children born to women in the 1979 sample of the National Longitudinal Survey of Youth (NLSY-79). These subjects were born from the mid-1970s through the mid-1990s, overlapping the same period covered by the standardizations examined by Dickens and Flynn, but showed no narrowing in the B-W difference in either achievement tests or a measure of verbal IQ.…”

The rise and fall of the Flynn Effect as a reason to expect a narrowing of the Black–White IQ gap☆

“…For example, Rushton and Jensen (2006) calculated that the mean Black gain on the IQ tests discussed by Dickens and Flynn (2006) was only 2.1 points (14%) because these authors, for a variety of proffered methodological reasons, had excluded several tests showing small, nil, and negative gains, and also because they had used a projected trend line that exaggerated the gain. Nor was there any evidence of narrowing on other IQ tests over the 1970 to 1992 time period (Murray, 2006(Murray, , 2007. Nisbett's (2009) claim of a 35% Black improvement on the NAEP tests is also greatly exaggerated.…”