Frequencies for man_coll variable in vehnit dataset :

  MANNER OF |
  COLLISION |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        444       31.87       31.87
          1 |        375       26.92       58.79
          2 |        110        7.90       66.69
          3 |         67        4.81       71.50
          4 |         57        4.09       75.59
          5 |        177       12.71       88.30
          6 |         18        1.29       89.59
          7 |         87        6.25       95.84
          8 |         17        1.22       97.06
          9 |         21        1.51       98.56
         10 |          2        0.14       98.71
         11 |          9        0.65       99.35
         99 |          9        0.65      100.00
------------+-----------------------------------
      Total |      1,393      100.00

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