A trio of researchers from the University of Cincinnati, the University of Colorado Boulder and Clemson University has found that college students giving evaluations of their professors in upper-level courses exhibited a gender bias based on the predominance of gender ratios of professors in a given department. In their paper published in Proceedings of the National Academy of Sciences, Oriana Aragón, Evava Pietri and Brian Powell describe analyzing more than 100,000 student evaluations at Clemson University.