Educability-and-Group-Differences-1973-by-Arthur-Robert-Jensen

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Subpopulation Differences in Educability 41 genetic model for continuous characters, which is based on Mendelian algebra and probability theory, is most lucidly explicated by Burt (1971). I- Variance {a2) is the average of the squared deviation of each individual in the population from the arithmetic mean of the population. The square root of the variance (
2 Current technical misconceptions and obfuscations Readers who have kept up with the current literature in this field are apt to have encountered a number of issues which have created confusion. It will pay to clear up these misconceptions so they will not interfere with the understanding of the more fundamental problems to be discussed in the remainder of this book. POPULATION V. INDIVIDUAL One current misconception concerns the meaning of heritability (henceforth signified by h2) in relation to individual measurements or test scores.* The fact that h2 is derived from the concepts and methods of the branch of genetics called quantitative genetics and depends upon population samples for its estimation has led some writers to believe, or at least to create the impression, that h2 has no relevance to individual scores. And there are some persons who apparently find some comfort in the notion that even though the estimation of h2 might have some validity with respect to a population, it has no relevance to the individual. An implicit extension of this line of reasoning is that since h2 is irrelevant for the individual and since populations are composed of individuals, h2 must really not mean anything in populations either. The fact is, h2 pertains both to individual scores and to population variance. What it does not pertain to is the population mean. * See Appendix on Heritability for an explanation of how h2 values are empirically obtained.
Page 1 and 2: Educability & Group Differences Art
Page 3 and 4: THE AUTHOR Since 1957 Dr. Arthur R.
Page 5 and 6: Ediicability and Group ^
Page 7 and 8: To the memory of Sir Cyril Burt e d
Page 9 and 10: List o f Tables 3.1 Correlations am
Page 11 and 12: 17.3 Theoretical regression lines b
Page 13 and 14: 2 Educability and Group Differences
Page 21 and 22: 10 Educability and Group Difference
Page 23 and 24: 1 4 16 24 16 ^ I 1 2 1 2 6 6 2 1610
Page 39 and 40: Subpopulation differences in educab
Page 51: 40 Educability and Group Difference
Page 83 and 84: j Intelligence and educability Educ
Page 91 and 92: Table 3.1 Correlations (decimals om
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92 Educability and Group Difference
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100 Educability and Group Differenc
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7 Race differences in intelligence
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8 Multiple and partial correlation
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244 Educabilty and Group Difference
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14 Teacher expectancy Credence in t
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ig Physical environment and mental
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20 Recapitulation The study of abil
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Appendix on Heritability Heritabili
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References a in s w o r t h , m . d
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398 Author Index Davis, A., 300 Dea
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400 Author Index Nichols, R. C., 10
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Author Index 401 Warren, B. L., 120
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cultural deprivation, 258 culture-b
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Making Xs Test of speed and persist
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Stanford-Binet Intelligence Scale,
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