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

       hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        294        2.94        2.94
          1 |        376        3.76        6.70
          2 |        220        2.20        8.90
          3 |        157        1.57       10.47
          4 |        191        1.91       12.38
          5 |        268        2.68       15.06
          6 |        284        2.84       17.90
          7 |        302        3.02       20.92
          8 |        302        3.02       23.94
          9 |        401        4.01       27.95
         10 |        337        3.37       31.32
         11 |        424        4.24       35.56
         12 |        482        4.82       40.38
         13 |        514        5.14       45.52
         14 |        653        6.53       52.05
         15 |        561        5.61       57.66
         16 |        559        5.59       63.25
         17 |        682        6.82       70.07
         18 |        608        6.08       76.15
         19 |        584        5.84       81.99
         20 |        507        5.07       87.06
         21 |        486        4.86       91.92
         22 |        416        4.16       96.08
         23 |        336        3.36       99.44
         24 |          3        0.03       99.47
         99 |         53        0.53      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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