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

Pre- Impact |
  Stability |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         85        0.85        0.85
          1 |      8,311       83.11       83.96
          2 |        471        4.71       88.67
          3 |        334        3.34       92.01
          4 |        440        4.40       96.41
          7 |         48        0.48       96.89
          9 |        311        3.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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