Frequencies for last_mo variable in vehicle dataset :

       LAST |
ACCIDENT-MO |
        NTH |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        444       62.01       62.01
          1 |         13        1.82       63.83
          2 |         15        2.09       65.92
          3 |         18        2.51       68.44
          4 |         21        2.93       71.37
          5 |         19        2.65       74.02
          6 |         18        2.51       76.54
          7 |         19        2.65       79.19
          8 |         23        3.21       82.40
          9 |         23        3.21       85.61
         10 |         24        3.35       88.97
         11 |         20        2.79       91.76
         12 |         14        1.96       93.72
         99 |         42        5.87       99.58
          . |          3        0.42      100.00
------------+-----------------------------------
      Total |        716      100.00

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