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

       hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        311        3.11        3.11
          1 |        351        3.51        6.62
          2 |        337        3.37        9.99
          3 |        226        2.26       12.25
          4 |        214        2.14       14.39
          5 |        221        2.21       16.60
          6 |        427        4.27       20.87
          7 |        354        3.54       24.41
          8 |        249        2.49       26.90
          9 |        263        2.63       29.53
         10 |        439        4.39       33.92
         11 |        413        4.13       38.05
         12 |        447        4.47       42.52
         13 |        473        4.73       47.25
         14 |        529        5.29       52.54
         15 |        583        5.83       58.37
         16 |        536        5.36       63.73
         17 |        585        5.85       69.58
         18 |        617        6.17       75.75
         19 |        582        5.82       81.57
         20 |        530        5.30       86.87
         21 |        434        4.34       91.21
         22 |        371        3.71       94.92
         23 |        407        4.07       98.99
         99 |        101        1.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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