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

  PRINCIPAL |
     IMPACT |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        814        8.14        8.14
          1 |        227        2.27       10.41
          2 |        272        2.72       13.13
          3 |        628        6.28       19.41
          4 |        106        1.06       20.47
          5 |        143        1.43       21.90
          6 |        376        3.76       25.66
          7 |        143        1.43       27.09
          8 |         99        0.99       28.08
          9 |        662        6.62       34.70
         10 |        131        1.31       36.01
         11 |        424        4.24       40.25
         12 |      4,300       43.00       83.25
         13 |        273        2.73       85.98
         14 |        272        2.72       88.70
         99 |        435        4.35       93.05
          . |        695        6.95      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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