1. Department of Government, Harvard University , 1737 Cambridge Street, Institute for Quantitative Social Science, Cambridge, MA 02138 , USA
2. Department of Statistics, Harvard University , 1737 Cambridge Street, Institute for Quantitative Social Science, Cambridge, MA 02138 , USA
3. School of Mathematics, Sun Yat-sen University , Guangzhou, Guangdong 510275 , China
4. Honorable S. William Green Professor of Public Law, Harvard Law School , 1525 Massachusetts Avenue, Griswold 504, Cambridge, MA 02138 , USA
5. Data Analyst, Access to Justice Lab at Harvard Law School , 1607 Massachusetts Avenue, Third Floor, Cambridge, MA 02138 , USA
6. Department of Government, Harvard University , Cambridge, MA 02138 , USA