Frequencies for man_coll variable in vehicle dataset :

  MANNOR OF |
  COLLISION |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        338       53.74       53.74
          1 |         39        6.20       59.94
          2 |        140       22.26       82.19
          4 |        100       15.90       98.09
          5 |          4        0.64       98.73
          6 |          8        1.27      100.00
------------+-----------------------------------
      Total |        629      100.00

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