Frequencies for first_mo variable in vehicle dataset :

      FIRST |
ACCIDENT-MO |
        NTH |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        440       56.70       56.70
          1 |         33        4.25       60.95
          2 |         24        3.09       64.05
          3 |         27        3.48       67.53
          4 |         21        2.71       70.23
          5 |         36        4.64       74.87
          6 |         25        3.22       78.09
          7 |         26        3.35       81.44
          8 |         14        1.80       83.25
          9 |         18        2.32       85.57
         10 |         23        2.96       88.53
         11 |         19        2.45       90.98
         12 |         19        2.45       93.43
         99 |         49        6.31       99.74
          . |          2        0.26      100.00
------------+-----------------------------------
      Total |        776      100.00

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