Frequencies for first 10,000 rows of timemd variable in namcs2003 dataset :

       time spent with |
             physician |      Freq.     Percent        Cum.
-----------------------+-----------------------------------
             0 minutes |        317        3.17        3.17
             2 minutes |          4        0.04        3.21
             3 minutes |          3        0.03        3.24
             4 minutes |          5        0.05        3.29
             5 minutes |        206        2.06        5.35
             6 minutes |         31        0.31        5.66
             7 minutes |         66        0.66        6.32
             8 minutes |        130        1.30        7.62
             9 minutes |         21        0.21        7.83
            10 minutes |      1,415       14.15       21.98
            11 minutes |         15        0.15       22.13
            12 minutes |        104        1.04       23.17
            13 minutes |         32        0.32       23.49
            14 minutes |         20        0.20       23.69
            15 minutes |      2,958       29.58       53.27
            16 minutes |         23        0.23       53.50
            17 minutes |         15        0.15       53.65
            18 minutes |         50        0.50       54.15
            19 minutes |          8        0.08       54.23
            20 minutes |      1,624       16.24       70.47
            21 minutes |          8        0.08       70.55
            22 minutes |         23        0.23       70.78
            23 minutes |         10        0.10       70.88
            24 minutes |          7        0.07       70.95
            25 minutes |        551        5.51       76.46
            26 minutes |          4        0.04       76.50
            27 minutes |         14        0.14       76.64
            28 minutes |         12        0.12       76.76
            29 minutes |          3        0.03       76.79
            30 minutes |      1,205       12.05       88.84
            31 minutes |          1        0.01       88.85
            32 minutes |          4        0.04       88.89
            33 minutes |          2        0.02       88.91
            34 minutes |          1        0.01       88.92
            35 minutes |        118        1.18       90.10
            36 minutes |          3        0.03       90.13
            37 minutes |          1        0.01       90.14
            38 minutes |          2        0.02       90.16
            40 minutes |        179        1.79       91.95
            41 minutes |          2        0.02       91.97
            42 minutes |          3        0.03       92.00
            43 minutes |          4        0.04       92.04
            45 minutes |        353        3.53       95.57
            46 minutes |          4        0.04       95.61
            48 minutes |          4        0.04       95.65
            49 minutes |          1        0.01       95.66
            50 minutes |        118        1.18       96.84
            51 minutes |          2        0.02       96.86
            52 minutes |          5        0.05       96.91
            53 minutes |          3        0.03       96.94
            54 minutes |          2        0.02       96.96
            55 minutes |         13        0.13       97.09
            58 minutes |          2        0.02       97.11
            59 minutes |          1        0.01       97.12
                1 hour |        176        1.76       98.88
  1 hour and 3 minutes |          5        0.05       98.93
  1 hour and 4 minutes |          4        0.04       98.97
  1 hour and 5 minutes |          6        0.06       99.03
  1 hour and 9 minutes |          1        0.01       99.04
 1 hour and 10 minutes |         10        0.10       99.14
 1 hour and 15 minutes |         16        0.16       99.30
 1 hour and 19 minutes |          1        0.01       99.31
 1 hour and 20 minutes |          1        0.01       99.32
 1 hour and 30 minutes |         45        0.45       99.77
 1 hour and 32 minutes |          1        0.01       99.78
 1 hour and 35 minutes |          1        0.01       99.79
               2 hours |         12        0.12       99.91
2 hours and 30 minutes |          2        0.02       99.93
2 hours and 32 minutes |          1        0.01       99.94
               3 hours |          5        0.05       99.99
               4 hours |          1        0.01      100.00
-----------------------+-----------------------------------
                 Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016