IQ’s of Identical Twins Reared Apart
TLDR
New analysis of the original data from the four largest studies of the intelligence of monozygotic twins reared apart leads to conclusions not found in the original studies or in previous reviews of them, indicating that magnitude of differential environmental effects is not systematically related to intelligence level of twin pairs.Abstract:
A new analysis of the original data from the four largest studies (Newman, Freeman and Holzinger, 1937; Shields, 1962; Juel-Nielsen, 1965; Burt, 1955) of the intelligence of monozygotic twins reared apart, totaling 122 twin pairs, leads to conclusions not found in the original studies or in previous reviews of them Statistical analysis of the twin differences reveals no significant differences among the twin samples in the four studies; all of them can thus be viewed statistically as samples from the same population They can therefore be pooled for more detailed and powerful statistical treatmentread more
Citations
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Journal Article
Cultural versus biological inheritance: phenotypic transmission from parents to children. (A theory of the effect of parental phenotypes on children's phenotypes).
Journal ArticleDOI
Growing up and growing apart: a developmental meta-analysis of twin studies.
TL;DR: Developmental change in twin similarity was examined with age contrasts in a meta-analysis of twin studies from 1967 through 1985 and indicated that there was a general tendency for some intraclass rs to decrease with age.
Book
The IQ Controversy, the Media and Public Policy
Mark Snyderman,Stanley Rothman +1 more
TL;DR: This article found that despite the common understanding to the contrary, most experts continue to believe that intelligence can be measured and that genetic endowment plays an important role in IQ, and the public's view of the IQ controversy has been shaped by inaccurate media coverage; and more importantly by changes in the nature of American liberalism as well as the key role of civil rights issues in American life.
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Progress and Degeneration in the 'IQ Debate' (II)
TL;DR: The hereditarian programme makes no predictions concerning the relative average intelligence of different racial or social groups as discussed by the authors, and it is perfectly consistent with any observed differences (or lack of them) in IQ between different groups.
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Improving the Teaching of Applied Statistics: Putting the Data Back into Data Analysis
Judith D. Singer,John B. Willett +1 more
TL;DR: In this paper, the authors argue that artificial data sets should be eliminated from the curriculum and that they should be replaced with real data sets, supplemented by suitable background material to enable students to acquire analytic skills in an authentic research context and enable instructors to demonstrate how statistical analysis is used to model real world phenomena.
References
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How Much Can We Boost IQ and Scholastic Achievement
Abstract: Arthur Jensen argues that the failure of recent compensatory education efforts to produce lasting effects on children's IQ and achievement suggests that the premises on which these efforts have been based should be reexamined.
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Twins: A Study of Heredity and Environment.
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The genetic determination of differences in intelligence: a study of monozygotic twins reared together and apart
TL;DR: It is argued that the high correlations for intelligence in so-called ‘identical’ twins implies that ‘intelligence’, when adequately assessed, is largely dependent on genetic constitution.
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Estimation of the limits of heritability of traits by comparison of monozygotic and dizygotic twins
TL;DR: This paper has three aims: to present a new formula for extracting heritability estimates from twin data, to show the results of the application of the formula to data from past studies of the heritability of intelligence, scholastic achievement, personality traits, and physical characteristics, and to urge that heritability Estimates be obtained in all large-scale educational testing programs.