Frequencies for first 10,000 rows of impact1 variable in person dataset :

     Impact |
Point-Initi |
         al |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        895        8.95        8.95
          1 |        632        6.32       15.27
          2 |        193        1.93       17.20
          3 |        633        6.33       23.53
          4 |         84        0.84       24.37
          5 |         85        0.85       25.22
          6 |        365        3.65       28.87
          7 |        118        1.18       30.05
          8 |         92        0.92       30.97
          9 |        552        5.52       36.49
         10 |        213        2.13       38.62
         11 |        688        6.88       45.50
         12 |      4,233       42.33       87.83
         13 |         42        0.42       88.25
         14 |        300        3.00       91.25
         15 |          3        0.03       91.28
         16 |          1        0.01       91.29
         99 |        148        1.48       92.77
          . |        723        7.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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