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

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Multiple and Partial Correlation Methods 205 (1) The multiple correlation, R EI, between a number of environmental measures (E) and intelligence (I) (2) The multiple correlation, R er between the environmental measures and the racial dichotomy treated as a quantized variable (3) The point-biserial correlation, rRI, between the racial dichotomy and intelligence. From these three correlations we can then obtain partial correlations, that is, correlations between each pair of variables with the effects of the third statistically held constant. Unfortunately, there are no data in the literature which permit the optimal use of this method, which consists of having multiple correlations of a large number of environmental variables with IQ and race. But we can illustrate the method using a single composite measure of the environment. A study by Tenopyr (1967) is interesting because it involves control of SES both by selection of subjects and by statistically partialling out SES from the correlations between race and abilities. The subjects were 167 Negro and white machine-shop trainees recruited from the low socioeconomic areas of the community (Los Angeles). They had an average of 11*9 years of education and their mother’s average education was 11*1 years. The whites were slightly but not significantly lower than the Negroes on a composite SES index based on the education of the subject, his mother’s education, and the status level of his father’s job. In addition to the SES index, three ability tests were given to all subjects: Verbal Comprehension (V), Numerical Ability (N ), and Spatial Visualization (S ). The correlations among all the variables are as follows: N S Race SES Verbal (V) 0-30 0-11 0-27 0-21 Numerical (N) 0-21 0-18 014 Spatial (S ) 0-21 0-04 Race* -0-09 * Negro = 0, W hite = 1 From these above correlations, we can obtain the following partial correlations:3
206 Educability and Group Differences V, Race .SES = 0-30/> < 0*01 N, SES. Race = 0-16
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Educability & Group Differences Art
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THE AUTHOR Since 1957 Dr. Arthur R.
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Ediicability and Group ^
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To the memory of Sir Cyril Burt e d
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List o f Tables 3.1 Correlations am
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17.3 Theoretical regression lines b
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2 Educability and Group Differences
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10 Educability and Group Difference
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1 4 16 24 16 ^ I 1 2 1 2 6 6 2 1610
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Subpopulation differences in educab
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2 Current technical misconceptions
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j Intelligence and educability Educ
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Table 3.1 Correlations (decimals om
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Table 3.3 Correlations (decimals om
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100 Educability and Group Differenc
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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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