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

    INITIAL |
     IMPACT |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        646        6.46        6.46
          1 |        385        3.85       10.31
          2 |        103        1.03       11.34
          3 |        492        4.92       16.26
          4 |        104        1.04       17.30
          5 |        105        1.05       18.35
          6 |        459        4.59       22.94
          7 |        113        1.13       24.07
          8 |        155        1.55       25.62
          9 |        494        4.94       30.56
         10 |        127        1.27       31.83
         11 |        543        5.43       37.26
         12 |      4,565       45.65       82.91
         13 |         67        0.67       83.58
         14 |        390        3.90       87.48
         18 |         42        0.42       87.90
         99 |        455        4.55       92.45
          . |        755        7.55      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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