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

pre- impact |
  stability |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         61        0.61        0.61
          1 |      7,976       79.76       80.37
          2 |        633        6.33       86.70
          3 |        341        3.41       90.11
          4 |        413        4.13       94.24
          7 |         70        0.70       94.94
          9 |        506        5.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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