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

✍ Scribed by A. Von Eye; G. A. Lienert

Book ID
101715603
Publisher
John Wiley and Sons
Year
1980
Tongue
English
Weight
391 KB
Volume
22
Category
Article
ISSN
0323-3847

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✦ Synopsis

Abstract

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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Heritability of bone density: Regional a
Heritability of bone density: Regional and gender differences in monozygotic twins
✍ Kevin Y. Tse; Brandon R. Macias; R. Scott Meyer; Alan R. Hargens πŸ“‚ Article πŸ“… 2009 πŸ› Elsevier Science 🌐 English βš– 79 KB πŸ‘ 1 views

## Abstract Bone mineral density (BMD) is a measure of a person's skeletal mineral content, and assessing BMD by dual x‐ray absorptiometry (DEXA) can help to diagnose diseases of low bone density. In this study, we determine the heritability of BMD in male and female monozygotic twin subjects using