Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
In 2000 Census microdata, various outcomes of second-generation immigrants are related to their parents age at arrival in the United States, and in particular whether that age fell within the "critical period" of language acquisition. We interpret this as an effect of the parents English-language skills and construct an instrumental variable for parental English proficiency. Estimates of the effect of parents English-speaking proficiency using two-stage least squares yield significant, positive results for childrens English-speaking proficiency and preschool attendance, and significant, negative results for dropping out of high school and being below age-appropriate grade.