Nonparametric evaluation of heritability by intra‐twin differences of mono‐ and dicygotic twins | Zendy

Von Eye A. | Zendy; Lienert G. A. | Zendy

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Nonparametric evaluation of heritability by intra‐twin differences of mono‐ and dicygotic twins

Author(s) -

Von Eye A.,

Lienert G. A.

Publication year - 1980

Publication title -

biometrical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.108

H-Index - 63

eISSN - 1521-4036

pISSN - 0323-3847

DOI - 10.1002/bimj.4710220606

Subject(s) - heritability , nonparametric statistics , heredity , statistics , dizygotic twins , trait , twin study , mathematics , test (biology) , covariate , econometrics , psychology , biology , medicine , genetics , computer science , paleontology , obstetrics , programming language

Starting from intratwin differences x – x of two cotwins X and X in a specified trait (e.g. IQ) the following prediction was made from heredity assumption: intratwin differences will be larger in dizygotic than in monozygotic twins and will, from theoretical reasons, not be distributed normally. Therefore nonparametric testing is suggested either by U ‐test or by median‐test depending on whether the differences differ in dispersion. Additionally descriptive measures of heritability were derived from the respective test statistics in such a way as to correspond to parametric heritability coefficients.

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