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

       hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        312        3.12        3.12
          1 |        456        4.56        7.68
          2 |        359        3.59       11.27
          3 |        176        1.76       13.03
          4 |        199        1.99       15.02
          5 |        212        2.12       17.14
          6 |        226        2.26       19.40
          7 |        259        2.59       21.99
          8 |        274        2.74       24.73
          9 |        303        3.03       27.76
         10 |        245        2.45       30.21
         11 |        403        4.03       34.24
         12 |        388        3.88       38.12
         13 |        406        4.06       42.18
         14 |        633        6.33       48.51
         15 |        591        5.91       54.42
         16 |        570        5.70       60.12
         17 |        566        5.66       65.78
         18 |        714        7.14       72.92
         19 |        609        6.09       79.01
         20 |        603        6.03       85.04
         21 |        577        5.77       90.81
         22 |        441        4.41       95.22
         23 |        451        4.51       99.73
         99 |         27        0.27      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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