The Chronicle collected monthly average base pay values from Glassdoor that had been recorded under the roles “graduate teaching assistant,” “graduate research assistant,” and “graduate assistant.” "Average base pay" values were also only collected if at least 20 submissions had been made to Glassdoor for each role at each school. The average calculated by Glassdoor does not control for time of submission. Median gross rent is the monthly rent agreed or contracted for plus the estimated monthly cost of utilities and fuels.