Frequencies for first 10,000 rows of timemd variable in namcs2009 dataset :

       time spent with |
             physician |      Freq.     Percent        Cum.
-----------------------+-----------------------------------
             0 minutes |        256        2.56        2.56
             2 minutes |          1        0.01        2.57
             3 minutes |          7        0.07        2.64
             4 minutes |         10        0.10        2.74
             5 minutes |        118        1.18        3.92
             6 minutes |         44        0.44        4.36
             7 minutes |         91        0.91        5.27
             8 minutes |        132        1.32        6.59
             9 minutes |         97        0.97        7.56
            10 minutes |      1,036       10.36       17.92
            11 minutes |        102        1.02       18.94
            12 minutes |        221        2.21       21.15
            13 minutes |        158        1.58       22.73
            14 minutes |        152        1.52       24.25
            15 minutes |      3,078       30.78       55.03
            16 minutes |        153        1.53       56.56
            17 minutes |        170        1.70       58.26
            18 minutes |        142        1.42       59.68
            19 minutes |        120        1.20       60.88
            20 minutes |      1,235       12.35       73.23
            21 minutes |         85        0.85       74.08
            22 minutes |        106        1.06       75.14
            23 minutes |         79        0.79       75.93
            24 minutes |         70        0.70       76.63
            25 minutes |        387        3.87       80.50
            26 minutes |         51        0.51       81.01
            27 minutes |         46        0.46       81.47
            28 minutes |         48        0.48       81.95
            29 minutes |         40        0.40       82.35
            30 minutes |        902        9.02       91.37
            31 minutes |         44        0.44       91.81
            32 minutes |         23        0.23       92.04
            33 minutes |         29        0.29       92.33
            34 minutes |         32        0.32       92.65
            35 minutes |        106        1.06       93.71
            36 minutes |         20        0.20       93.91
            37 minutes |         32        0.32       94.23
            38 minutes |         16        0.16       94.39
            39 minutes |          7        0.07       94.46
            40 minutes |        110        1.10       95.56
            41 minutes |          9        0.09       95.65
            42 minutes |          6        0.06       95.71
            43 minutes |          6        0.06       95.77
            44 minutes |         13        0.13       95.90
            45 minutes |        180        1.80       97.70
            46 minutes |          4        0.04       97.74
            47 minutes |          4        0.04       97.78
            48 minutes |          7        0.07       97.85
            49 minutes |          1        0.01       97.86
            50 minutes |         50        0.50       98.36
            51 minutes |          4        0.04       98.40
            52 minutes |          4        0.04       98.44
            53 minutes |          5        0.05       98.49
            54 minutes |          2        0.02       98.51
            55 minutes |         13        0.13       98.64
            56 minutes |          3        0.03       98.67
            59 minutes |          2        0.02       98.69
                1 hour |         92        0.92       99.61
   1 hour and 1 minute |          1        0.01       99.62
  1 hour and 2 minutes |          3        0.03       99.65
  1 hour and 3 minutes |          3        0.03       99.68
  1 hour and 4 minutes |          2        0.02       99.70
  1 hour and 5 minutes |          8        0.08       99.78
  1 hour and 9 minutes |          1        0.01       99.79
 1 hour and 10 minutes |          3        0.03       99.82
 1 hour and 14 minutes |          1        0.01       99.83
 1 hour and 15 minutes |          7        0.07       99.90
 1 hour and 16 minutes |          1        0.01       99.91
 1 hour and 20 minutes |          2        0.02       99.93
 1 hour and 30 minutes |          3        0.03       99.96
 1 hour and 45 minutes |          2        0.02       99.98
               2 hours |          1        0.01       99.99
 2 hours and 8 minutes |          1        0.01      100.00
-----------------------+-----------------------------------
                 Total |     10,000      100.00

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