Frequencies for pman_coll variable in parkwork dataset :

  Manner of |
  Collision |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        800       79.84       79.84
          1 |         43        4.29       84.13
          2 |         19        1.90       86.03
          6 |        119       11.88       97.90
          7 |         12        1.20       99.10
          8 |          6        0.60       99.70
          9 |          2        0.20       99.90
         11 |          1        0.10      100.00
------------+-----------------------------------
      Total |      1,002      100.00

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