Frequencies for impact2 variable in person dataset :

     Impact |
Point-Princ |
       ipal |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        154       11.65       11.65
          1 |         66        4.99       16.64
          2 |          2        0.15       16.79
          3 |         99        7.49       24.28
          4 |          3        0.23       24.51
          5 |          7        0.53       25.04
          6 |         27        2.04       27.08
          7 |          6        0.45       27.53
          9 |         35        2.65       30.18
         10 |          6        0.45       30.64
         11 |         52        3.93       34.57
         12 |        492       37.22       71.79
         13 |        111        8.40       80.18
         14 |          1        0.08       80.26
         15 |          5        0.38       80.64
          . |        256       19.36      100.00
------------+-----------------------------------
      Total |      1,322      100.00

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