Frequencies for proxyqualityreduction variable in impact2018 dataset :

      Proxy |
    Quality |
  Reduction |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      3,254       96.56       96.56
          1 |        116        3.44      100.00
------------+-----------------------------------
      Total |      3,370      100.00

by Jean Roth , jroth@nber.org , 30 Aug 2017