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

Pre- Impact |
  Stability |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         81        0.81        0.81
          1 |      8,308       83.08       83.89
          2 |        495        4.95       88.84
          3 |        391        3.91       92.75
          4 |        442        4.42       97.17
          7 |         40        0.40       97.57
          9 |        243        2.43      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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