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

  PRINCIPAL |
     IMPACT |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        879        8.79        8.79
          1 |        208        2.08       10.87
          2 |        215        2.15       13.02
          3 |        568        5.68       18.70
          4 |        182        1.82       20.52
          5 |        107        1.07       21.59
          6 |        425        4.25       25.84
          7 |        126        1.26       27.10
          8 |         65        0.65       27.75
          9 |        690        6.90       34.65
         10 |        117        1.17       35.82
         11 |        379        3.79       39.61
         12 |      4,407       44.07       83.68
         13 |        222        2.22       85.90
         14 |        216        2.16       88.06
         99 |        469        4.69       92.75
          . |        725        7.25      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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