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

     Impact |
Point-Princ |
       ipal |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        852        8.52        8.52
          1 |        619        6.19       14.71
          2 |        142        1.42       16.13
          3 |        644        6.44       22.57
          4 |        122        1.22       23.79
          5 |        107        1.07       24.86
          6 |        311        3.11       27.97
          7 |        123        1.23       29.20
          8 |        169        1.69       30.89
          9 |        562        5.62       36.51
         10 |        148        1.48       37.99
         11 |        803        8.03       46.02
         12 |      4,031       40.31       86.33
         13 |        124        1.24       87.57
         14 |        268        2.68       90.25
         15 |         40        0.40       90.65
         16 |         23        0.23       90.88
         99 |        116        1.16       92.04
          . |        796        7.96      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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