http://www.leiterrankings.com/faculty/2005faculty_impact_cites.shtml - ranking NYU's faculty as better than Mich
"Since many frequently cited articles are cited because they contain succinct statements of boilerplate propositions of law or of a particular academic approach to some set of issues, or because they fall squarely within a particular academic paradigm whose proponents make a practice of citing each other, the frequency of an author's citations has little to do with his influence, much less with the quality of his work. "
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And the SCOTUS rankings are so similar in both terms as to be laughable; your interpretation doesn't account for NYU's larger class size either.