Tom Bell (Chapman) has a great post, How Top-Ranked Law Schools Got That Way, Pt. 1:

How do law schools make it to the top of the U.S. News & World Report rankings? …

The items on the left of the graph count for more of each school's overall score, whereas the items on right count for less. We would thus expect the line tracing the maximum weighted z-scores for each item to drop from a high, at PeerRep (a measure of a school's reputation, worth 25% of its overall score), to a low, at Lib (a measure of library volumes and equivalents, worth only .75%). Instead, however, the maximum line droops at Emp9 (employment nine months after graduation) and soars at Over$/Stu (overhead expenditures per student).