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Genetic endowments and twins
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assortive mating assume assumptions average background variables basic model bias biases brothers Chapter coefficient estimates cognitive ability common environment covariance demand curves determined direct effects discussed DZ twins environmental indices equality of outcomes estimated coefficients example expected value Fagerlind family effects family environment family income GCT scores genes genetic and environmental genetic effects genetic endowments genetic indices genotypic genotypic correlation Griliches group by age heritability human capital identified included individuals inequality of opportunity intergenerational intergenerational mobility intragenerational investment latent variable model likelihood function logarithm mailing mature earnings mature occupational status measurement error MZ and DZ MZ pairs Navy NRC twin number of siblings observed variables obtained Olneck omitted variable bias ordinary least squares parameters parents phenotypic questionnaire recursive reduced form relations respondents sample Sewell and Hauser significant socioeconomic success specified group twin pairs unobserved variance veterans zero zygosity