Rank 31+: a dummy variable equal to 1 if the department is ranked from 31 to 88, based on the LLS. News and World Report in 2017. Note that the omitted dummy variable are departments ranked in the top 10, so you can interpret the coefcient results on these variables as relative to the omitted category: departments in the top 10 in the country. Faculty share women: the ratio of faculty in the department who are women. For example, if one of the observations is 0.25, it means that 25 percent of the faculty are female. Average cohort size: the average size of the entering class at each program over the past 20 years or so. Medium city: dummy variable equal to 1 if the department is located in a city with a population more 150,000 people, but not one of the 15 largest metropolitan areas. Large city: dummy variable equal to 1 if the department is located in one of the top 15 metropolitan areas in the United States