Frequencies for first 10,000 rows of timemd variable in namcs2000 dataset :

       time spent with |
physician (in minutes) |      Freq.     Percent        Cum.
-----------------------+-----------------------------------
             0 minutes |        429        4.29        4.29
              1 minute |          2        0.02        4.31
             2 minutes |          3        0.03        4.34
             3 minutes |         22        0.22        4.56
             4 minutes |         18        0.18        4.74
             5 minutes |        222        2.22        6.96
             6 minutes |         37        0.37        7.33
             7 minutes |         76        0.76        8.09
             8 minutes |         83        0.83        8.92
             9 minutes |         21        0.21        9.13
            10 minutes |      1,604       16.04       25.17
            11 minutes |         15        0.15       25.32
            12 minutes |        156        1.56       26.88
            13 minutes |         28        0.28       27.16
            14 minutes |         40        0.40       27.56
            15 minutes |      3,616       36.16       63.72
            16 minutes |         22        0.22       63.94
            17 minutes |         19        0.19       64.13
            18 minutes |         49        0.49       64.62
            19 minutes |          3        0.03       64.65
            20 minutes |      1,684       16.84       81.49
            21 minutes |          6        0.06       81.55
            22 minutes |          7        0.07       81.62
            23 minutes |          5        0.05       81.67
            24 minutes |          1        0.01       81.68
            25 minutes |        305        3.05       84.73
            26 minutes |          2        0.02       84.75
            27 minutes |          1        0.01       84.76
            28 minutes |          4        0.04       84.80
            29 minutes |          2        0.02       84.82
            30 minutes |      1,038       10.38       95.20
            32 minutes |          1        0.01       95.21
            34 minutes |          2        0.02       95.23
            35 minutes |         55        0.55       95.78
            36 minutes |          2        0.02       95.80
            37 minutes |          1        0.01       95.81
            38 minutes |          2        0.02       95.83
            39 minutes |          3        0.03       95.86
            40 minutes |        103        1.03       96.89
            42 minutes |          1        0.01       96.90
            45 minutes |        171        1.71       98.61
            48 minutes |          1        0.01       98.62
            50 minutes |         33        0.33       98.95
            55 minutes |          7        0.07       99.02
                1 hour |         72        0.72       99.74
   1 hour and 1 minute |          2        0.02       99.76
  1 hour and 5 minutes |          5        0.05       99.81
 1 hour and 15 minutes |          4        0.04       99.85
 1 hour and 22 minutes |          1        0.01       99.86
 1 hour and 30 minutes |          1        0.01       99.87
 1 hour and 39 minutes |          1        0.01       99.88
 1 hour and 40 minutes |          1        0.01       99.89
 1 hour and 45 minutes |          1        0.01       99.90
               2 hours |          7        0.07       99.97
2 hours and 40 minutes |          3        0.03      100.00
-----------------------+-----------------------------------
                 Total |     10,000      100.00

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