Frequencies for first 10,000 rows of timemd variable in namcs2004 dataset :

       time spent with |
             physician |      Freq.     Percent        Cum.
-----------------------+-----------------------------------
             0 minutes |        338        3.38        3.38
              1 minute |          1        0.01        3.39
             3 minutes |         11        0.11        3.50
             4 minutes |          7        0.07        3.57
             5 minutes |        300        3.00        6.57
             6 minutes |         33        0.33        6.90
             7 minutes |         48        0.48        7.38
             8 minutes |         99        0.99        8.37
             9 minutes |         12        0.12        8.49
            10 minutes |      1,538       15.38       23.87
            11 minutes |         11        0.11       23.98
            12 minutes |         97        0.97       24.95
            13 minutes |         18        0.18       25.13
            14 minutes |         26        0.26       25.39
            15 minutes |      3,321       33.21       58.60
            16 minutes |         22        0.22       58.82
            17 minutes |         17        0.17       58.99
            18 minutes |         44        0.44       59.43
            19 minutes |          6        0.06       59.49
            20 minutes |      1,398       13.98       73.47
            21 minutes |         13        0.13       73.60
            22 minutes |         32        0.32       73.92
            23 minutes |         13        0.13       74.05
            24 minutes |          8        0.08       74.13
            25 minutes |        391        3.91       78.04
            26 minutes |          7        0.07       78.11
            27 minutes |          4        0.04       78.15
            28 minutes |          6        0.06       78.21
            29 minutes |          1        0.01       78.22
            30 minutes |      1,170       11.70       89.92
            31 minutes |          6        0.06       89.98
            32 minutes |          4        0.04       90.02
            34 minutes |          2        0.02       90.04
            35 minutes |         97        0.97       91.01
            36 minutes |          2        0.02       91.03
            37 minutes |          1        0.01       91.04
            38 minutes |          2        0.02       91.06
            39 minutes |          2        0.02       91.08
            40 minutes |        141        1.41       92.49
            41 minutes |          1        0.01       92.50
            42 minutes |          2        0.02       92.52
            43 minutes |          2        0.02       92.54
            45 minutes |        356        3.56       96.10
            47 minutes |          1        0.01       96.11
            48 minutes |          3        0.03       96.14
            49 minutes |          2        0.02       96.16
            50 minutes |         93        0.93       97.09
            51 minutes |          1        0.01       97.10
            53 minutes |          2        0.02       97.12
            55 minutes |         28        0.28       97.40
            56 minutes |          8        0.08       97.48
            57 minutes |          1        0.01       97.49
            58 minutes |          1        0.01       97.50
                1 hour |        189        1.89       99.39
  1 hour and 2 minutes |          2        0.02       99.41
  1 hour and 5 minutes |          5        0.05       99.46
  1 hour and 9 minutes |          1        0.01       99.47
 1 hour and 10 minutes |          2        0.02       99.49
 1 hour and 15 minutes |          9        0.09       99.58
 1 hour and 18 minutes |          1        0.01       99.59
 1 hour and 20 minutes |          3        0.03       99.62
 1 hour and 25 minutes |          2        0.02       99.64
 1 hour and 27 minutes |          1        0.01       99.65
 1 hour and 30 minutes |         18        0.18       99.83
 1 hour and 40 minutes |          2        0.02       99.85
 1 hour and 45 minutes |          1        0.01       99.86
               2 hours |          5        0.05       99.91
2 hours and 30 minutes |          1        0.01       99.92
               3 hours |          3        0.03       99.95
3 hours and 30 minutes |          1        0.01       99.96
               4 hours |          4        0.04      100.00
-----------------------+-----------------------------------
                 Total |     10,000      100.00

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