Frequencies for hour variable in vehnit dataset :

       hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         61        5.47        5.47
          1 |         66        5.91       11.38
          2 |         49        4.39       15.77
          3 |         58        5.20       20.97
          4 |         53        4.75       25.72
          5 |         29        2.60       28.32
          6 |         30        2.69       31.00
          7 |         36        3.23       34.23
          8 |         26        2.33       36.56
          9 |         26        2.33       38.89
         10 |         31        2.78       41.67
         11 |         56        5.02       46.68
         12 |         42        3.76       50.45
         13 |         47        4.21       54.66
         14 |         62        5.56       60.22
         15 |         36        3.23       63.44
         16 |         34        3.05       66.49
         17 |         44        3.94       70.43
         18 |         54        4.84       75.27
         19 |         51        4.57       79.84
         20 |         62        5.56       85.39
         21 |         51        4.57       89.96
         22 |         48        4.30       94.27
         23 |         63        5.65       99.91
         99 |          1        0.09      100.00
------------+-----------------------------------
      Total |      1,116      100.00

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