Measurement and Cross-Country Differences

Figure v comparison of coefficient of transmission

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Unformatted text preview: very well measured. FIGURE V Comparison of Coefficient of Transmission from Parent to Child Graph shows coefficient from a regression of child’s outcome on mother’s outcome for adoptees and nonadoptees in the sample. Source: Sacerdote (2007) 141 A STUDY OF KOREAN AMERICAN ADOPTEES TABLE V PROPORTION OF OUTCOME VARIANCE EXPLAINED BY HERITABILITY, SHARED FAMILY ENVIRONMENT, AND NON-SHARED ENVIRONMENT USING A SIMPLE BEHAVIORAL GENETICS MODEL Outcome Has 4 years of college Highest grade completed Family income Log (family income) Drinks Smokes Height Weight BMI Overweight Attended US News ranked school Acceptance rate of school Married Number of children Proportion explained by nurture (shared family environment) Proportion explained by nature (heritability) Unexplained portion (non-shared environment) 0.135 0.157 0.110 0.139 0.336 0.152 0.014 0.044 0.115 0.087 0.249 0.406 0.443 0.334 0.324 0.055 0.273 0.858 0.458 0.308 0.172 0.335 0.459 0.400 0.556 0.537 0.609 0.575 0.128 0.498 0.577 0.741 0.417 0.337 0.245 0.418 0.076 0.105 0.056 0.196 0.979 0.699 I use the simple BG model described in the text to decompose the variance in each outcome into the portions attributable to genes (heritability), shared family environment, and non-shared family environment (i.e., the unexplained portion). See equations (2), (2A), and the paragraph that follows. those of Lichtenstein, Pedersen, and McClearn [1992] who find that family environment explains 21 percent of the variance, and Scarr, and Weinberg [1994] who find an adoptive sibling correlation of .13. Teasdale, and Owen [1984] find an adoptive sibling correlation of .43. All three of these studies use completely different samples. Teasdale and Owen are examining a small sample of Danish siblings reared apart and Lichtenstein et al. are examining a small sample of Swedish twins reared apart. Differential selection of adoptees into families could explain the differences in results, or perhaps there is something fundamentally different about outcomes for siblin...
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