Bias in the estimation of heritability from truncated samples of twins
Received: 16 November 1981 Accepted: 10 March 1982 DOI:
10.1007/BF01065638 Cite this article as: Martin, N.G. & Wilson, S.R. Behav Genet (1982) 12: 467. doi:10.1007/BF01065638 Abstract
Sampling twins from a truncated distribution and ignoring this truncation in the estimation procedure lowers correlation coefficients and can considerably bias estimates of the proportions of genetic and environmental variance. A greater proportion of DZ than MZ twins will be missed in sampling for any heritable trait. The implications for two published sets of educational achievement data are considered.
Key Words bias heritability truncation twins educational achievement References
Bulmer, M. G. (1970).
The Biology of Twinning in Man, Oxford University Press, London.
Curnow, R. N., and Dunnet, C. W. (1962). The numerical evaluation of certain multivariate normal integrals.
Ann. Math. Stat.
Eaves, L. J., Last, K. A., Young, P. A., and Martin, N. G. (1978). Model-fitting approaches to the analysis of human behaviour.
Jinks, J. L., and Fulker, D. W. (1970). Comparison of the biometrical genetical, MAVA, and classical approaches to the analysis of human behavior.
Psychol. Bull., 73:311–349.
Loehlin, J. C., and Nichols, R. C. (1976).
Heredity, Environment & Personality, University of Texas Press, Austin and London.
Lykken, D. T., Tellegen, A., and DeRubeis, R. (1978). Volunteer bias in twin research: The rule of two-thirds.
Martin, N. G. (1975). The inheritance of scholastic abilities in a sample of twins. II. Genetical analysis of examination results.
Ann. Hum. Genet. Lond.
39:219–229. Copyright information
© Plenum Publishing Corporation 1982