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An investigation of...
An investigation of a measure of twins' equal environments
- Article/chapterEnglish2007
Publisher, publication year, extent ...
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2012-02-21
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Cambridge University Press (CUP),2007
Numbers
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LIBRIS-ID:oai:prod.swepub.kib.ki.se:116363800
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http://kipublications.ki.se/Default.aspx?queryparsed=id:116363800URI
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https://doi.org/10.1375/twin.10.6.840DOI
Supplementary language notes
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Language:English
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Summary in:English
Part of subdatabase
Classification
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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The equal environments assumption, which holds that trait-relevant environments are equally correlated among monozygotic (MZ) and dizygotic (DZ) twin pairs, is essential to twin designs. Violations of this assumption could lead to biased parameter estimates in twin models. A variety of methods and measures have been used to test this assumption. No studies to date have evaluated the measurement invariance of such items or examined the distribution of the underlying equal environments trait. The current study was an investigation of the psychometric properties of a self-report measure of twins' equal environments. Exploratory and confirmatory factor analysis results indicated that items loaded onto ‘child’ and ‘teen’ equal environments factors. Factor loadings and factor variances and their covariance were invariant for MZ and DZ twins; however, DZ twins had significantly lower factor means than MZ twins. Further, these items demonstrated adequate test–retest reliability. Lastly, the child and teen factors may be bimodally distributed, particularly for MZ twin pairs. Measurement invariance issues, as well as distributions of equal environments traits, should be considered when evaluating the equal environments assumption, in order to produce accurate parameter estimates in twin models.
Added entries (persons, corporate bodies, meetings, titles ...)
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Mazzeo, SE
(author)
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Bulik, CMKarolinska Institutet
(author)
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Aggen, SH
(author)
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Kendler, KS
(author)
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Neale, MC
(author)
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Karolinska Institutet
(creator_code:org_t)
Related titles
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In:Twin research and human genetics : the official journal of the International Society for Twin Studies: Cambridge University Press (CUP)10:6, s. 840-8471832-4274
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In:Twin Research and Human Genetics: Cambridge University Press (CUP)10:6, s. 840-8471839-2628
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