Comparative Sibling Resemblance in Intelligence in Family Groups |
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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 FAMILY2 SCHOOL Clinic Group assigned CLINIC GROUP FAMILY coefficient of variation COMPARATIVE SIBLING RESEMBLANCE comparison group D/o diff difference in parent DOCTOR OF PHILOSOPHY eliminated factors FAMILY CLINIC FAMILY2 FAMILY FAMILY GROUP FAMILY GROUP CLINIC FAMILY GROUP2 SCHOOL Family Resemblance family sizes father's age girl GROUP CLINIC GROUP GROUP FAMILY GROUP2 GROUP2 SCHOOL GROUP groups of unrelated heredity I. Q. INDEX I. Q. INDEX I. Q. INDEX inheritance of intelligence INTELLIGENCE IN FAMILY less variability ligence logical age matched mental traits months old mother's age natal interval pairs of siblings parent age possible determinants Possible Effectors Psychological Clinic REC'D MAR recomputed represent resemblance in intel resemblance in intelligence Social Service Department Standard Deviation Steckel 43 tabulated test battery TION AV University of Pennsylvania unrelated children similar unrelated group variation indices