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

       hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        232        2.32        2.32
          1 |        356        3.56        5.88
          2 |        293        2.93        8.81
          3 |        165        1.65       10.46
          4 |        163        1.63       12.09
          5 |        251        2.51       14.60
          6 |        346        3.46       18.06
          7 |        338        3.38       21.44
          8 |        235        2.35       23.79
          9 |        320        3.20       26.99
         10 |        343        3.43       30.42
         11 |        380        3.80       34.22
         12 |        512        5.12       39.34
         13 |        546        5.46       44.80
         14 |        529        5.29       50.09
         15 |        637        6.37       56.46
         16 |        546        5.46       61.92
         17 |        581        5.81       67.73
         18 |        720        7.20       74.93
         19 |        582        5.82       80.75
         20 |        598        5.98       86.73
         21 |        447        4.47       91.20
         22 |        433        4.33       95.53
         23 |        367        3.67       99.20
         99 |         80        0.80      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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