Taking advantage of unique longitudinal data, we provide the first characterization of what college students believe at … of why students hold the initial beliefs about majors that they do. The data collection and analysis are based directly … that students enter school quite optimistic about obtaining a science degree, but that relatively few students end up …

best viewed as the end result of a learning process. We find that students enter college as open to a major in math or … science as to any other major group, but that a large number of students move away from math and science after realizing that … because students realize that their ability in math/science is lower than expected rather than because students realize that …

observed patterns of interaction. We find that, while much sorting exists at all stages of college, black and white students … friends as randomly assigned roommates of the same race. Further, we find that, in the long-run, white students who are … randomly assigned black roommates have a significantly larger proportion of black friends than white students who are randomly …