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

  PRINCIPAL |
     IMPACT |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        920        9.20        9.20
          1 |        321        3.21       12.41
          2 |        102        1.02       13.43
          3 |        590        5.90       19.33
          4 |         90        0.90       20.23
          5 |        129        1.29       21.52
          6 |        348        3.48       25.00
          7 |        129        1.29       26.29
          8 |         66        0.66       26.95
          9 |        759        7.59       34.54
         10 |        227        2.27       36.81
         11 |        407        4.07       40.88
         12 |      4,256       42.56       83.44
         13 |        204        2.04       85.48
         14 |        219        2.19       87.67
         18 |         39        0.39       88.06
         99 |        625        6.25       94.31
          . |        569        5.69      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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