Frequencies for first 10,000 rows of a_imp2 variable in veh_aux dataset :

  Principal |
     Impact |
      Point |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        662        6.62        6.62
          2 |      5,859       58.59       65.21
          3 |      1,000       10.00       75.21
          4 |        568        5.68       80.89
          5 |      1,191       11.91       92.80
          6 |        587        5.87       98.67
          7 |        133        1.33      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016