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

  PRINCIPAL |
     IMPACT |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        807        8.07        8.07
          1 |        259        2.59       10.66
          2 |         91        0.91       11.57
          3 |        576        5.76       17.33
          4 |         89        0.89       18.22
          5 |         90        0.90       19.12
          6 |        468        4.68       23.80
          7 |         98        0.98       24.78
          8 |         65        0.65       25.43
          9 |        681        6.81       32.24
         10 |        104        1.04       33.28
         11 |        358        3.58       36.86
         12 |      4,576       45.76       82.62
         13 |        304        3.04       85.66
         14 |        139        1.39       87.05
         18 |         52        0.52       87.57
         99 |        628        6.28       93.85
          . |        615        6.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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