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Tag Archives: IQ
Interview: Refuting arguments about IQ bias & discrimination effects
This is a discussion between myself and Lipton Matthews. Are IQ test biased? Discrimination Does Not Explain Gaps in Social Status Here are articles related to this discussion:
Posted in Behavioral Genetics, Psychometrics
Tagged IQ, Race
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Adoption (IQ) gain of Institutionalized, Deprived Children: So Many Problems
Posted in Psychometrics
Tagged IQ, Psychology
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Testing The Race of Mother Hypothesis: A Technical Review
Posted in Psychometrics
Tagged IQ
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The Bell Curve, 20 years after
Posted in Behavioral Genetics, Book Review, Psychometrics
Tagged IQ
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How to calculate and use predicted Y-values in multiple regression
Here, I will explain how to use the so-called “Yhat” or predicted values of Y when doing regression (OLS, logistic and multilevel). (Update 2017) This article is based on my paper: Hu, M. (2017). An update on the secular narrowing of … Continue reading
Posted in IQ Survey & Analysis, Stats, Softwares, Syntax
Tagged IQ
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The study of deaf people since Braden (1994)
Earlier, I have reviewed Braden’s (1994) book, Deafness, Deprivation, and IQ. Considerable amount of studies have been conducted since then. The focus is on the validity of measures of intelligence among the deaf population, such as reliability, predictive validity, measurement … Continue reading
Posted in Behavioral Genetics, Psychometrics
Tagged IQ
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Book review of Deafness, Deprivation, and IQ (Braden 1994)
Jeffery P. Braden. (1994). Deafness, deprivation, and IQ. Springer. See also. The study of deaf people since Braden (1994). Meng Hu’s Blog. The book is a compilation of studies on deaf people, which concludes that cultural deprivation due to deafness … Continue reading
Posted in Behavioral Genetics, Book Review, Psychometrics
Tagged IQ
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Studies of IQ heritability among Chimpanzees
IQ heritability among humans is well-known state of research. Much less has been done on chimpanzees. Hopkins et al. (2014) published a recent study that touches the subject. 99 chimpanzees, aged 9 to 54 (mean = 24.55, SD = 10.67), … Continue reading
Posted in Behavioral Genetics
Tagged IQ
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Racial differences in the long-term trend NAEP scores (1975/78-2012)
I analyze the LTT NAEP achievement scores, a public data set available at NCES. In general, minority-majority ethnic groups show a secular decline in d gap, for both math and reading tests, and this occurs at all ages of assessment … Continue reading
Posted in IQ Survey & Analysis
Tagged IQ
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Income mobility according to the Great Gatsby curve : The fantasy of the american dream, statistical artifacts, and the irrelevance of public intervention.
Among the economists, it is commonly held that US people do not experience high income mobility. This is true. But the question of whether US people have lower income or social mobility compared to european countries has no definitive answer. … Continue reading
Posted in Behavioral Genetics, Economics
Tagged Free Market, IQ
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Multiple Regression, Multiple Fallacies
It goes without saying that multiple regression is one of most popular and applied statistical methods. Thus, it would be odd if most practitioners among scientists and researchers do not understand and misapply it. And yet, this provocative conclusion seems … Continue reading
Research on genetic g and differential heritabilities
Multivariate genetic analyses and simple correlational analyses have been conducted to evaluate the extent to which the general factor (g) of intelligence is differentially heritable, compared to, for example, group factors. A positive correlation would be supportive of Jensen’s view, … Continue reading
Posted in Behavioral Genetics
Tagged IQ
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Multivariate genetic analysis of cognitive abilities in an adolescent twin sample
The study I want to present here is an important one, although rarely cited in Google Scholar. It shows that the second-order genetic g exists among reaction/inspection time tasks. In reality, some other studies (e.g., Luo et al., 1994; Cardon … Continue reading
Posted in Behavioral Genetics
Tagged IQ
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Genotype-Environment Correlation and IQ
Genotype-Environment Correlation and IQ John C. Loehlin and John C. DeFries Received 22 Feb. 1986–Final 22 Jan. 1987 The estimation of various forms of genotype-environment (GE) correlation is considered. Two methods of estimating “passive” GE correlation from adoption studies are … Continue reading
Posted in Behavioral Genetics, Stats
Tagged IQ
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Structural relationship between g, parental SES, and Achievement : Investigation of the g nexus
The present analysis, using the NLSY97, attempts to model the structural relationship between the latent second-order g factor extracted from the 12 ASVAB subtests, the parental SES latent factor from 3 indicators of parental SES, and the GPA latent factor … Continue reading
Posted in IQ Survey & Analysis, Psychometrics
Tagged IQ
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Transracially adopted intermediate IQ : Hereditarian nonsense
A bad, invalid argument commonly used by hereditarians is the research concerning transracial adoption. The claim usually made is that black, black-white mixed-race, white, asian-white mixed-race adoptees had IQs following the well-established genetic hierarchy seemingly B < BW < W < … Continue reading
Posted in Psychometrics
Tagged IQ
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Race-SES Interaction : Some Evidence of Increasing Black-White IQ Differences With SES Levels From Various Survey Data
I present here some more evidence about the race*SES interaction concerning IQ from various survey data. The techniques are employed. Comparison of means among different SES strata, ANCOVA and multiple regression.
Posted in IQ Survey & Analysis
Tagged IQ
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Flynn contra Rushton on principal component analysis : A failed replication
While Rushton (1999) demonstrates, using PCA, that g and black-white differences were related, with Flynn Effect (FE) gains over time showing no relationship with the aforementioned variables, Flynn (2000) has challenged Rushton in arguing that Wechsler’s subtest loadings on the … Continue reading
Posted in Psychometrics
Tagged IQ
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IQ Testing : From Correlation to Causation
It is well known and acknowledged that IQ correlates with social outcomes (Herrnstein & Murray, 1994; Jensen, 1980, 1998; Gottfredson, 1997), measures of health (Gottfredson, 2004, & Deary, 2004; Reeve & Basalik, 2010), wages (Jones & Schneider, 2008), savings (Jones, 2012), job performance (Ree & Earles, 1994; Schmidt … Continue reading
Jensen effect on racial IQ differences and GPA controlling for SES in the NLSY79 and NLSY97
In The g Factor, Jensen (1998, pp. 384-385) states that because races differ in SES levels, the Spearman-Jensen effect (i.e., g-loading correlates) found in racial IQ differences (hispanics, denoted H; blacks, denoted B; whites, denoted W) could simply reflect this … Continue reading
Posted in IQ Survey & Analysis, Psychometrics
Tagged IQ
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Meng Hu's Blog 