Frequencies for first 10,000 rows of permvit variable in accident dataset :

  Number of |
 Persons in |
      Motor |
   Vehicles |
In-Transpor |
          t |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         13        0.13        0.13
          1 |      4,192       41.92       42.05
          2 |      2,646       26.46       68.51
          3 |      1,441       14.41       82.92
          4 |        775        7.75       90.67
          5 |        412        4.12       94.79
          6 |        227        2.27       97.06
          7 |        117        1.17       98.23
          8 |         63        0.63       98.86
          9 |         47        0.47       99.33
         10 |         20        0.20       99.53
         11 |         20        0.20       99.73
         12 |          8        0.08       99.81
         13 |          5        0.05       99.86
         14 |          6        0.06       99.92
         15 |          1        0.01       99.93
         17 |          2        0.02       99.95
         18 |          2        0.02       99.97
         23 |          1        0.01       99.98
         24 |          1        0.01       99.99
         33 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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