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

     Impact |
Point-Princ |
       ipal |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        902        9.02        9.02
          1 |        648        6.48       15.50
          2 |        113        1.13       16.63
          3 |        736        7.36       23.99
          4 |         40        0.40       24.39
          5 |        133        1.33       25.72
          6 |        310        3.10       28.82
          7 |        123        1.23       30.05
          8 |         84        0.84       30.89
          9 |        644        6.44       37.33
         10 |        108        1.08       38.41
         11 |        870        8.70       47.11
         12 |      3,946       39.46       86.57
         13 |         91        0.91       87.48
         14 |        273        2.73       90.21
         15 |         28        0.28       90.49
         16 |         15        0.15       90.64
         99 |         84        0.84       91.48
          . |        852        8.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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