Frequencies for first_mo variable in vehicle dataset :

      FIRST |
ACCIDENT-MO |
        NTH |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        317       67.16       67.16
          1 |         26        5.51       72.67
          2 |          9        1.91       74.58
          3 |         18        3.81       78.39
          4 |          6        1.27       79.66
          5 |          9        1.91       81.57
          6 |          6        1.27       82.84
          7 |          7        1.48       84.32
          8 |          5        1.06       85.38
          9 |          8        1.69       87.08
         10 |          3        0.64       87.71
         11 |          8        1.69       89.41
         12 |         11        2.33       91.74
         99 |         39        8.26      100.00
------------+-----------------------------------
      Total |        472      100.00

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