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

     Impact |
Point-Princ |
       ipal |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        908        9.08        9.08
          1 |        601        6.01       15.09
          2 |        118        1.18       16.27
          3 |        665        6.65       22.92
          4 |        102        1.02       23.94
          5 |        100        1.00       24.94
          6 |        329        3.29       28.23
          7 |        159        1.59       29.82
          8 |        104        1.04       30.86
          9 |        590        5.90       36.76
         10 |        164        1.64       38.40
         11 |        619        6.19       44.59
         12 |      4,184       41.84       86.43
         13 |        133        1.33       87.76
         14 |        217        2.17       89.93
         15 |         24        0.24       90.17
         16 |          8        0.08       90.25
         99 |        154        1.54       91.79
          . |        821        8.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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