Heredity and environment: a critical survey of recently published material on twins and foster children, Issues 47-48
Social Science Research Council, Jun 1, 1941 - Science - 95 pages
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ability accuracy of prediction activity actuarial adjustment score applied approximation arithmetic mean associated attributes average behavior characteristics child combination configuration considered correlation ratio determine diagonal matrix discussion distribution effect equation errors of prediction estimate example experimental factor analysis field formulation foster children foster homes fraternals function given heredity and environment homoscedastic identical twins identicals reared important indicate individual differences intelligence internal consistency interview investigator large number least squares linear marriage mathematical matrix mean ment mental method multiple correlation number of variables obtained orphanage ovum pairs parents parole persons placement points population possible prediction score predictive factors predictive variables probably procedure projects Psychology quantitative variates questionnaire random rater ratings relatively reliability sample selection siblings situation social standard deviation standard errors standard scores statistical Study B-4 subcategories Supplementary Study techniques tion traits twin method variance vector vocational zero