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

     Impact |
Point-Princ |
       ipal |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        891        8.91        8.91
          1 |        547        5.47       14.38
          2 |        143        1.43       15.81
          3 |        730        7.30       23.11
          4 |        113        1.13       24.24
          5 |        117        1.17       25.41
          6 |        307        3.07       28.48
          7 |        125        1.25       29.73
          8 |        137        1.37       31.10
          9 |        683        6.83       37.93
         10 |        170        1.70       39.63
         11 |        609        6.09       45.72
         12 |      4,128       41.28       87.00
         13 |        120        1.20       88.20
         14 |        243        2.43       90.63
         15 |         41        0.41       91.04
         16 |          7        0.07       91.11
         99 |        143        1.43       92.54
          . |        746        7.46      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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