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

     Impact |
Point-Princ |
       ipal |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        895        8.95        8.95
          1 |        510        5.10       14.05
          2 |        180        1.80       15.85
          3 |        712        7.12       22.97
          4 |        120        1.20       24.17
          5 |        103        1.03       25.20
          6 |        318        3.18       28.38
          7 |        107        1.07       29.45
          8 |        124        1.24       30.69
          9 |        637        6.37       37.06
         10 |        160        1.60       38.66
         11 |        607        6.07       44.73
         12 |      4,177       41.77       86.50
         13 |        158        1.58       88.08
         14 |        270        2.70       90.78
         15 |         36        0.36       91.14
         16 |         13        0.13       91.27
         99 |        150        1.50       92.77
          . |        723        7.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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