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

 Crash Date |
    (Month) |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        769        7.69        7.69
          2 |        704        7.04       14.73
          3 |        747        7.47       22.20
          4 |        819        8.19       30.39
          5 |        862        8.62       39.01
          6 |        819        8.19       47.20
          7 |        880        8.80       56.00
          8 |        854        8.54       64.54
          9 |        906        9.06       73.60
         10 |        933        9.33       82.93
         11 |        889        8.89       91.82
         12 |        818        8.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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