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

pre- impact |
  stability |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         69        0.69        0.69
          1 |      7,658       76.58       77.27
          2 |        723        7.23       84.50
          3 |        302        3.02       87.52
          4 |        362        3.62       91.14
          5 |         46        0.46       91.60
          7 |         41        0.41       92.01
          9 |        799        7.99      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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