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

     Impact |
Point-Princ |
       ipal |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        545        5.45        5.45
          1 |        375        3.75        9.20
          2 |        263        2.63       11.83
          3 |        757        7.57       19.40
          4 |         74        0.74       20.14
          5 |         92        0.92       21.06
          6 |        241        2.41       23.47
          7 |        120        1.20       24.67
          8 |         75        0.75       25.42
          9 |        713        7.13       32.55
         10 |        113        1.13       33.68
         11 |        577        5.77       39.45
         12 |      3,924       39.24       78.69
         13 |      1,029       10.29       88.98
         14 |        153        1.53       90.51
         99 |         71        0.71       91.22
          . |        878        8.78      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Apr 2016