Testing for Racial Differences in the Mental Ability of Young Children
利用新数据集发现，黑人和白人婴儿的测试成绩差异很小，但到两岁时其他种族儿童相对于白人差距显著扩大；结合先前研究，模型表明环境差异可完全解释智力差距。
Using a new nationally representative dataset, we find minor differences in test outcomes between black and white infants that disappear with a limited set of controls. However, relative to whites, all other races lose substantial ground by age two. Combining our estimates with results in prior literature, we show that a simple model with assortative mating fits our data well, implying that differences in children's environments between racial groups can fully explain gaps in intelligence. If parental ability influences a child's test scores both genetically and through environment, then our findings are less informative and can be reconciled with a wide range of racial differences in inherited intelligence.