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

     Impact |
Point-Princ |
       ipal |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        910        9.10        9.10
          1 |        715        7.15       16.25
          2 |        134        1.34       17.59
          3 |        661        6.61       24.20
          4 |         66        0.66       24.86
          5 |         97        0.97       25.83
          6 |        332        3.32       29.15
          7 |        130        1.30       30.45
          8 |        110        1.10       31.55
          9 |        625        6.25       37.80
         10 |        166        1.66       39.46
         11 |        720        7.20       46.66
         12 |      3,966       39.66       86.32
         13 |        101        1.01       87.33
         14 |        326        3.26       90.59
         15 |         41        0.41       91.00
         16 |         19        0.19       91.19
         99 |         61        0.61       91.80
          . |        820        8.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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