Frequencies for man_coll variable in vehicle dataset :

  MANNOR OF |
  COLLISION |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        393       51.44       51.44
          1 |         58        7.59       59.03
          2 |        125       16.36       75.39
          4 |        164       21.47       96.86
          5 |          6        0.79       97.64
          6 |         18        2.36      100.00
------------+-----------------------------------
      Total |        764      100.00

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