Frequencies for first_mo variable in vehicle dataset :

      FIRST |
ACCIDENT-MO |
        NTH |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        325       51.92       51.92
          1 |         40        6.39       58.31
          2 |         36        5.75       64.06
          3 |         26        4.15       68.21
          4 |         24        3.83       72.04
          5 |         16        2.56       74.60
          6 |         21        3.35       77.96
          7 |          8        1.28       79.23
          8 |         19        3.04       82.27
          9 |         17        2.72       84.98
         10 |         13        2.08       87.06
         11 |         12        1.92       88.98
         12 |         10        1.60       90.58
         99 |         58        9.27       99.84
          . |          1        0.16      100.00
------------+-----------------------------------
      Total |        626      100.00

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