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

     Impact |
Point-Initi |
         al |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,136       11.36       11.36
          1 |        603        6.03       17.39
          2 |        167        1.67       19.06
          3 |        527        5.27       24.33
          4 |         91        0.91       25.24
          5 |         84        0.84       26.08
          6 |        378        3.78       29.86
          7 |        119        1.19       31.05
          8 |        127        1.27       32.32
          9 |        538        5.38       37.70
         10 |        199        1.99       39.69
         11 |        703        7.03       46.72
         12 |      4,149       41.49       88.21
         13 |         22        0.22       88.43
         14 |        219        2.19       90.62
         15 |          5        0.05       90.67
         16 |          3        0.03       90.70
         99 |        109        1.09       91.79
          . |        821        8.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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