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The intellectual resemblance between sibs
Author(s) -
MAXWELL JAMES,
PILLINER A. E. G.
Publication year - 1959
Publication title -
annals of human genetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.537
H-Index - 77
eISSN - 1469-1809
pISSN - 0003-4800
DOI - 10.1111/j.1469-1809.1959.tb01712.x
Subject(s) - correlation , statistics , selection (genetic algorithm) , sample size determination , demography , mathematics , geometry , artificial intelligence , sociology , computer science
Summary The younger sibs of a random sample of 11‐year‐old Scottish children were tested individually as they reached the age of 11 years. The average intelligence of the younger sibs is found to be lower than that of the random sample, and explanations of this difference are discussed. It is shown, however, that if one ‘average’ sib is taken for each subject, then the mean score of these ‘sibs’ is not significantly different from that of their subjects. Some implications for the selection of samples of sibs are examined, together with the effect of incomplete families on the estimation of the relationship between intelligence test score and size of sibship. Different methods of ascertaining the correlation for i.q . among sibs are discussed, and the results presented. The correlation coefficient for I.Q. between sibs is found to be of the order of r =+ 0.5.