Frequencies for pman_coll variable in parkwork dataset :

  Manner of |
  Collision |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        866       81.39       81.39
          1 |         27        2.54       83.93
          2 |         22        2.07       86.00
          6 |        129       12.12       98.12
          7 |         16        1.50       99.62
          8 |          3        0.28       99.91
         11 |          1        0.09      100.00
------------+-----------------------------------
      Total |      1,064      100.00

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