You mean the Americans we're not graduating, and the Indian and Chinese we are . . . who then return to their home countries? That doesn't sound like good public policy.
Disclaimer: I know nothing about about the National Opinion Research Center at the University of Chicago.
Many of the Native Americans in graduate schools are in the “soft” sciences,” like psychlogy, sociology and education. This would be the field preferred by women, who are now the majority in higher education. They don’t like engineering and science.