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age and sex average I. Q. average intelligence quotient birth month birth order child child's birth chrono chronological age CLINIC FAMILYj SCHOOL Clinic Group assigned CLINIC GROUP FAMILY coefficient of variation COMPARATIVE SIBLING RESEMBLANCE comparison group difference in parent DOCTOR OF PHILOSOPHY Effectors of Family eliminated ELISABETH DAVIES factors FAMILY CLINIC FAMILYj FAMILY GROUP CLINIC Family Resemblance FAMILY SIZE FAMILY father's age girl GROUP CLINIC GROUP groups of unrelated heredity I. Q. VARIA inheritance of intelligence INTELLIGENCE IN FAMILY less variability ligence logical age matched mental traits months old mother mother's age natal interval pairs of siblings parent age PHILADELPHIA 1936 possible determinants Possible Effectors Psychological Clinic QUOTIENTS AND VARIATION recomputed represent resemblance in intel resemblance in intelligence SCHOOL GROUP VARIA Social Service Department Standard Deviation Steckel 43 tabulated test battery Thurstone and Jenkins TION INDEX VARIA University of Pennsylvania unrelated children similar unrelated group variation indices