Frequencies for first 10,000 rows of impact1 variable in person dataset :

     Impact |
Point-Initi |
         al |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        981        9.81        9.81
          1 |        601        6.01       15.82
          2 |        168        1.68       17.50
          3 |        680        6.80       24.30
          4 |         56        0.56       24.86
          5 |         73        0.73       25.59
          6 |        284        2.84       28.43
          7 |         81        0.81       29.24
          8 |         91        0.91       30.15
          9 |        680        6.80       36.95
         10 |        105        1.05       38.00
         11 |        568        5.68       43.68
         12 |      4,483       44.83       88.51
         13 |         44        0.44       88.95
         14 |        194        1.94       90.89
         15 |          2        0.02       90.91
         99 |         44        0.44       91.35
          . |        865        8.65      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Apr 2016