Frequencies for first 10,000 rows of impact2 variable in person dataset :

     Impact |
Point-Princ |
       ipal |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        851        8.51        8.51
          1 |        537        5.37       13.88
          2 |        139        1.39       15.27
          3 |        639        6.39       21.66
          4 |         95        0.95       22.61
          5 |        117        1.17       23.78
          6 |        389        3.89       27.67
          7 |        139        1.39       29.06
          8 |        133        1.33       30.39
          9 |        620        6.20       36.59
         10 |        153        1.53       38.12
         11 |        653        6.53       44.65
         12 |      3,951       39.51       84.16
         13 |        186        1.86       86.02
         14 |        312        3.12       89.14
         15 |         28        0.28       89.42
         16 |         14        0.14       89.56
         99 |        246        2.46       92.02
          . |        798        7.98      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016