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

       hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        377        3.77        3.77
          1 |        331        3.31        7.08
          2 |        383        3.83       10.91
          3 |        269        2.69       13.60
          4 |        222        2.22       15.82
          5 |        346        3.46       19.28
          6 |        343        3.43       22.71
          7 |        323        3.23       25.94
          8 |        296        2.96       28.90
          9 |        276        2.76       31.66
         10 |        329        3.29       34.95
         11 |        407        4.07       39.02
         12 |        415        4.15       43.17
         13 |        464        4.64       47.81
         14 |        506        5.06       52.87
         15 |        520        5.20       58.07
         16 |        524        5.24       63.31
         17 |        635        6.35       69.66
         18 |        601        6.01       75.67
         19 |        507        5.07       80.74
         20 |        484        4.84       85.58
         21 |        493        4.93       90.51
         22 |        423        4.23       94.74
         23 |        396        3.96       98.70
         99 |        130        1.30      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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