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

  PRINCIPAL |
     IMPACT |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        966        9.66        9.66
          1 |        223        2.23       11.89
          2 |        260        2.60       14.49
          3 |        590        5.90       20.39
          4 |         90        0.90       21.29
          5 |         92        0.92       22.21
          6 |        465        4.65       26.86
          7 |        145        1.45       28.31
          8 |         91        0.91       29.22
          9 |        743        7.43       36.65
         10 |        105        1.05       37.70
         11 |        381        3.81       41.51
         12 |      4,380       43.80       85.31
         13 |         49        0.49       85.80
         14 |        295        2.95       88.75
         99 |        458        4.58       93.33
          . |        667        6.67      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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