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

       hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        345        3.45        3.45
          1 |        295        2.95        6.40
          2 |        337        3.37        9.77
          3 |        178        1.78       11.55
          4 |        248        2.48       14.03
          5 |        253        2.53       16.56
          6 |        305        3.05       19.61
          7 |        356        3.56       23.17
          8 |        282        2.82       25.99
          9 |        284        2.84       28.83
         10 |        313        3.13       31.96
         11 |        343        3.43       35.39
         12 |        432        4.32       39.71
         13 |        522        5.22       44.93
         14 |        526        5.26       50.19
         15 |        735        7.35       57.54
         16 |        536        5.36       62.90
         17 |        646        6.46       69.36
         18 |        649        6.49       75.85
         19 |        559        5.59       81.44
         20 |        489        4.89       86.33
         21 |        515        5.15       91.48
         22 |        391        3.91       95.39
         23 |        386        3.86       99.25
         24 |          1        0.01       99.26
         99 |         74        0.74      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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