Frequencies for a_mancol variable in acc_aux dataset :

  Manner of |
  Collision |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        369       70.69       70.69
          2 |         25        4.79       75.48
          3 |         42        8.05       83.52
          4 |         77       14.75       98.28
          5 |          9        1.72      100.00
------------+-----------------------------------
      Total |        522      100.00

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