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

     Impact |
Point-Princ |
       ipal |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      1,066       10.66       10.66
          1 |        640        6.40       17.06
          2 |        122        1.22       18.28
          3 |        723        7.23       25.51
          4 |         53        0.53       26.04
          5 |         89        0.89       26.93
          6 |        293        2.93       29.86
          7 |        123        1.23       31.09
          8 |         69        0.69       31.78
          9 |        682        6.82       38.60
         10 |         86        0.86       39.46
         11 |        661        6.61       46.07
         12 |      4,042       40.42       86.49
         13 |        180        1.80       88.29
         14 |        202        2.02       90.31
         15 |         29        0.29       90.60
         99 |         65        0.65       91.25
          . |        875        8.75      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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