|
National Bureau of Economic Research (United States)
62
|
Brookings Institution (United States)
23
|
Centre for Economic Policy Research (United Kingdom)
18
|
|
Center for International Development (United States)
9
|
Center for Education Policy Analysis (United States)
4
|
Fondazione Eni Enrico Mattei (Italy)
1
|
|
Mathematica Policy Research (United States)
1
|
Resources for the Future (United States)
1
|
