Frequencies for first 10,000 rows of pcrash4 variable in vehicle dataset :

pre- impact |
  stability |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         51        0.51        0.51
          1 |      7,333       73.33       73.84
          2 |        784        7.84       81.68
          3 |        218        2.18       83.86
          4 |        309        3.09       86.95
          5 |         58        0.58       87.53
          7 |         12        0.12       87.65
          9 |      1,235       12.35      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Oct 2016