Frequencies for qualityreduction variable in impact2016 dataset :

    Quality |
  Reduction |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      3,392       98.40       98.40
          1 |         55        1.60      100.00
------------+-----------------------------------
      Total |      3,447      100.00

by Jean Roth , jroth@nber.org , 16 Dec 2016