Frequencies for man_coll variable in accident dataset :

  MANNOR OF |
  COLLISION |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        328       70.84       70.84
          1 |         16        3.46       74.30
          2 |         65       14.04       88.34
          4 |         48       10.37       98.70
          5 |          2        0.43       99.14
          6 |          4        0.86      100.00
------------+-----------------------------------
      Total |        463      100.00

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