Frequencies for first 10,000 rows of impact2 variable in vehicle dataset :

     Impact |
Point-Princ |
       ipal |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        403        4.03        4.03
          1 |        539        5.39        9.42
          2 |        218        2.18       11.60
          3 |        871        8.71       20.31
          4 |         66        0.66       20.97
          5 |        131        1.31       22.28
          6 |        326        3.26       25.54
          7 |        164        1.64       27.18
          8 |         98        0.98       28.16
          9 |        923        9.23       37.39
         10 |        114        1.14       38.53
         11 |        620        6.20       44.73
         12 |      4,381       43.81       88.54
         13 |        836        8.36       96.90
         14 |        228        2.28       99.18
         99 |         82        0.82      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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