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

     Impact |
Point-Princ |
       ipal |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,136       11.36       11.36
          1 |        490        4.90       16.26
          2 |        128        1.28       17.54
          3 |        605        6.05       23.59
          4 |        108        1.08       24.67
          5 |        114        1.14       25.81
          6 |        379        3.79       29.60
          7 |        131        1.31       30.91
          8 |        165        1.65       32.56
          9 |        651        6.51       39.07
         10 |        167        1.67       40.74
         11 |        592        5.92       46.66
         12 |      4,071       40.71       87.37
         13 |         98        0.98       88.35
         14 |        205        2.05       90.40
         15 |         19        0.19       90.59
         16 |         12        0.12       90.71
         99 |        108        1.08       91.79
          . |        821        8.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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