Within twin estimation 

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does education reduce probability being overweight pdf
... estimation we eliminate the bias by unobserved differences within pairs of identical twins that are constant over time. in addition, measurement error in schooling is an important concern in within-twin estimation ... within-twin estimator controls for all unobserved genetic and family factors that are shared by the identical twins. there are two important concerns in the use of within-twin estimation ...
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effect childhood conduct disorder human capital pdf
... within pairs of twins. if severe conduct disorder behaviours of one twin also have negative effects on the human capital accumulation of the other twin, then using within twin estimation ... findings from previous studies based on within-sibling estimation and using smaller sets of indicators of conduct disorder. although the within-twin estimates suggest substantial deleterious effects of ...
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