你有沒有看他的本文啊？

”I indexed and ranked these schools by a premium that was taken from the averaged difference between all majors and the national averages by college.“

不是隻是比一個學校的全部平均， 而是把一個學校的每一個major和全國的那個major來比 然後差額一個major一個major的加起來平均 然後再以這總差額平均來排名