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

pre- impact |
  stability |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         64        0.64        0.64
          1 |      7,814       78.14       78.78
          2 |        663        6.63       85.41
          3 |        298        2.98       88.39
          4 |        333        3.33       91.72
          5 |         66        0.66       92.38
          7 |         41        0.41       92.79
          9 |        721        7.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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