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The nine science and engineering fields sum to the total; non-S&E spend — the law school and the business school — is left out.
The same dollars divided two ways — funding depth per doctoral student, and research run per PI. A large school can outspend a small one and still run less per lab, which is why the absolute figure above only measures institution size.
231full-time academic staff
55 more instructional staff are part-time, not counted above.
IPEDS splits instruction from research inconsistently between schools, so the parent total here is all full-time academic staff rather than instructional faculty alone.