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

       hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        258        2.58        2.58
          1 |        327        3.27        5.85
          2 |        268        2.68        8.53
          3 |        277        2.77       11.30
          4 |        255        2.55       13.85
          5 |        313        3.13       16.98
          6 |        382        3.82       20.80
          7 |        378        3.78       24.58
          8 |        289        2.89       27.47
          9 |        351        3.51       30.98
         10 |        314        3.14       34.12
         11 |        454        4.54       38.66
         12 |        377        3.77       42.43
         13 |        430        4.30       46.73
         14 |        527        5.27       52.00
         15 |        653        6.53       58.53
         16 |        587        5.87       64.40
         17 |        579        5.79       70.19
         18 |        594        5.94       76.13
         19 |        505        5.05       81.18
         20 |        524        5.24       86.42
         21 |        484        4.84       91.26
         22 |        408        4.08       95.34
         23 |        371        3.71       99.05
         24 |          3        0.03       99.08
         99 |         92        0.92      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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