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

    persons |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,984       19.84       19.84
          2 |      3,505       35.05       54.89
          3 |      1,994       19.94       74.83
          4 |      1,103       11.03       85.86
          5 |        632        6.32       92.18
          6 |        336        3.36       95.54
          7 |        184        1.84       97.38
          8 |         99        0.99       98.37
          9 |         63        0.63       99.00
         10 |         28        0.28       99.28
         11 |         27        0.27       99.55
         12 |         14        0.14       99.69
         13 |          3        0.03       99.72
         14 |          9        0.09       99.81
         15 |          4        0.04       99.85
         16 |          2        0.02       99.87
         17 |          3        0.03       99.90
         19 |          1        0.01       99.91
         20 |          2        0.02       99.93
         21 |          1        0.01       99.94
         24 |          1        0.01       99.95
         25 |          1        0.01       99.96
         29 |          1        0.01       99.97
         31 |          1        0.01       99.98
         41 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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