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

       hour |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        356        3.56        3.56
          1 |        351        3.51        7.07
          2 |        284        2.84        9.91
          3 |        160        1.60       11.51
          4 |        224        2.24       13.75
          5 |        246        2.46       16.21
          6 |        294        2.94       19.15
          7 |        330        3.30       22.45
          8 |        237        2.37       24.82
          9 |        299        2.99       27.81
         10 |        304        3.04       30.85
         11 |        378        3.78       34.63
         12 |        479        4.79       39.42
         13 |        473        4.73       44.15
         14 |        505        5.05       49.20
         15 |        689        6.89       56.09
         16 |        543        5.43       61.52
         17 |        665        6.65       68.17
         18 |        614        6.14       74.31
         19 |        590        5.90       80.21
         20 |        563        5.63       85.84
         21 |        501        5.01       90.85
         22 |        399        3.99       94.84
         23 |        456        4.56       99.40
         24 |          5        0.05       99.45
         99 |         55        0.55      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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