The Scale and Selectivity of Foreign-Born PhD Recipients in the US
研究了美国科学工程领域外籍博士生的规模与选择性，重点关注中国、印度、韩国和台湾学生，发现这些学生选择性高，但中国学生的选择性随时间下降。
We study the scale and selectivity of foreign-born PhD students in science and engineering. We focus on students from China, India, Korea, and Taiwan, which together account for most roughly one-third of science and engineering PhD students in the United States. The selectivity of these students is high, as measured by their fathers' relative education levels. In China and India, fathers of students who receive US PhDs in these fields are roughly 15 times more likely to have a BA degree than their contemporaries are to have tertiary education. Over time, selectivity falls for China but the trend for other countries is ambiguous.