A note on the IQ of monozygotic twins raised apart and the order of their birth
- 1 October 1976
- journal article
- research article
- Published by Springer Nature in Behavior Genetics
- Vol. 6 (4) , 455-460
- https://doi.org/10.1007/bf01065701
Abstract
This note examines James Shields' sample of monozygotic twins raised apart to entertain the hypothesis that there is a significant association between the measured IQ of these twins and the order of their birth. A non-parametric test supports this hypothesis and then a linear probability function is estimated that discriminates the effects on IQ of birth order from the effects of birth weight.Keywords
This publication has 4 references indexed in Scilit:
- Birth order effects: Not here, not now].Psychological Bulletin, 1972
- An investigation of the difference in measured intelligence between twins and single births*Annals of Human Genetics, 1970
- Effects of birth weight on later intelligenceSocial Biology, 1969
- Birth Order and Its SequelaeScience, 1966