The top 20 departments in the U.S. (mean score in parentheses):

1.  New York University (4.8)

2.  Princeton University (4.4)

2.  Rutgers University, New Brunswick (4.4)

4.  University of Michigan, Ann Arbor (4.2)

5.  Yale University (4.1)

6.  Harvard University (4.0)

6.  University of Pittsburgh (4.0)

8.  Stanford University (3.9)

8.  University of Southern California (3.9)

10. Columbia University (3.8)

10. University of California, Berkeley (3.8)

10. University of California, Los Angeles (3.8)

13. Massachussetts Institute of Technology (3.7)

13. University of Arizona (3.7)

13. University of North Carolina, Chapel Hill (3.7)

16. City University of New York Graduate Center (3.6)

17. Cornell University (3.5)

17. University of Notre Dame (3.5)

17. University of Texas, Austin (3.5)

20. Brown University (3.4)

The top 10 departments in the UK (mean scores in parentheses):

1.  Oxford University (4.6)

2.  Cambridge University (3.5)

3.  University of St. Andrews/University of Stirling Joint Program (3.2)

4.  University of Edinburgh (3.0)

5.  King's College, London (2.9)

6.  London School of Economics (2.8)

6.  University College London (2.8)

8.  University of Birmingham (2.7)

8.  University of Leeds (2.7)

10. University of Bristol (2.6)

10. University of Sheffield (2.6)