James Thomas, "The Signal Quality of Grades across Academic Fields",
Journal of Applied Econometrics, Vol. 34, No. 4, 2019, pp. 566-587.

The Campus Life and Learning (CLL) data are confidential restricted 
access data collected and maintained by the Duke University Department 
of Sociology. To gain access to the CLL data for research purposes, 
please contact

  Professor Kenneth I. Spenner
  phone: 919-660-5625
  e-mail: kspen [AT] soc.duke.edu

For further information about the CLL data including surveys, technical 
reports, and additional contacts, please visit 

http://www.soc.duke.edu/undergraduate/cll/