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

     Impact |
Point-Princ |
       ipal |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      2,213       22.13       22.13
          1 |      1,285       12.85       34.98
          2 |        165        1.65       36.63
          3 |        536        5.36       41.99
          4 |         62        0.62       42.61
          5 |         41        0.41       43.02
          6 |        282        2.82       45.84
          7 |         61        0.61       46.45
          8 |         43        0.43       46.88
          9 |        566        5.66       52.54
         10 |        128        1.28       53.82
         11 |        447        4.47       58.29
         12 |      3,119       31.19       89.48
         13 |        148        1.48       90.96
         14 |         78        0.78       91.74
         99 |         34        0.34       92.08
          . |        792        7.92      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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