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

     Impact |
Point-Princ |
       ipal |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        933        9.33        9.33
          1 |        486        4.86       14.19
          2 |        245        2.45       16.64
          3 |        765        7.65       24.29
          4 |         37        0.37       24.66
          5 |         58        0.58       25.24
          6 |        269        2.69       27.93
          7 |        124        1.24       29.17
          8 |         61        0.61       29.78
          9 |        680        6.80       36.58
         10 |        205        2.05       38.63
         11 |        680        6.80       45.43
         12 |      3,992       39.92       85.35
         13 |        380        3.80       89.15
         14 |        203        2.03       91.18
         99 |         20        0.20       91.38
          . |        862        8.62      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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