Frequencies for first 10,000 rows of day variable in vehicle dataset :

        day |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        426        4.26        4.26
          2 |        360        3.60        7.86
          3 |        342        3.42       11.28
          4 |        331        3.31       14.59
          5 |        308        3.08       17.67
          6 |        312        3.12       20.79
          7 |        341        3.41       24.20
          8 |        312        3.12       27.32
          9 |        353        3.53       30.85
         10 |        309        3.09       33.94
         11 |        303        3.03       36.97
         12 |        327        3.27       40.24
         13 |        352        3.52       43.76
         14 |        301        3.01       46.77
         15 |        332        3.32       50.09
         16 |        386        3.86       53.95
         17 |        342        3.42       57.37
         18 |        351        3.51       60.88
         19 |        299        2.99       63.87
         20 |        315        3.15       67.02
         21 |        306        3.06       70.08
         22 |        323        3.23       73.31
         23 |        327        3.27       76.58
         24 |        299        2.99       79.57
         25 |        334        3.34       82.91
         26 |        293        2.93       85.84
         27 |        325        3.25       89.09
         28 |        342        3.42       92.51
         29 |        268        2.68       95.19
         30 |        300        3.00       98.19
         31 |        181        1.81      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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