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

     Impact |
Point-Initi |
         al |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        902        9.02        9.02
          1 |        813        8.13       17.15
          2 |        125        1.25       18.40
          3 |        601        6.01       24.41
          4 |         33        0.33       24.74
          5 |        116        1.16       25.90
          6 |        326        3.26       29.16
          7 |        139        1.39       30.55
          8 |         73        0.73       31.28
          9 |        557        5.57       36.85
         10 |        106        1.06       37.91
         11 |        916        9.16       47.07
         12 |      3,971       39.71       86.78
         13 |         28        0.28       87.06
         14 |        354        3.54       90.60
         15 |          3        0.03       90.63
         99 |         85        0.85       91.48
          . |        852        8.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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