Frequencies for first 10,000 rows of timemd variable in namcs2006 dataset :

       time spent with |
             physician |      Freq.     Percent        Cum.
-----------------------+-----------------------------------
             0 minutes |        338        3.38        3.38
              1 minute |         14        0.14        3.52
             2 minutes |         14        0.14        3.66
             4 minutes |          7        0.07        3.73
             5 minutes |        190        1.90        5.63
             6 minutes |         24        0.24        5.87
             7 minutes |         43        0.43        6.30
             8 minutes |         81        0.81        7.11
             9 minutes |         28        0.28        7.39
            10 minutes |      1,212       12.12       19.51
            11 minutes |         12        0.12       19.63
            12 minutes |         52        0.52       20.15
            13 minutes |         15        0.15       20.30
            14 minutes |         20        0.20       20.50
            15 minutes |      3,775       37.75       58.25
            16 minutes |         20        0.20       58.45
            17 minutes |         16        0.16       58.61
            18 minutes |         32        0.32       58.93
            19 minutes |          3        0.03       58.96
            20 minutes |      1,846       18.46       77.42
            21 minutes |          7        0.07       77.49
            22 minutes |         21        0.21       77.70
            23 minutes |          8        0.08       77.78
            24 minutes |          7        0.07       77.85
            25 minutes |        450        4.50       82.35
            26 minutes |          4        0.04       82.39
            28 minutes |         14        0.14       82.53
            29 minutes |          3        0.03       82.56
            30 minutes |      1,010       10.10       92.66
            32 minutes |          7        0.07       92.73
            33 minutes |          1        0.01       92.74
            34 minutes |          1        0.01       92.75
            35 minutes |        111        1.11       93.86
            36 minutes |          7        0.07       93.93
            37 minutes |          3        0.03       93.96
            38 minutes |         21        0.21       94.17
            39 minutes |         10        0.10       94.27
            40 minutes |        122        1.22       95.49
            41 minutes |          1        0.01       95.50
            42 minutes |          3        0.03       95.53
            43 minutes |          2        0.02       95.55
            44 minutes |          4        0.04       95.59
            45 minutes |        221        2.21       97.80
            46 minutes |          1        0.01       97.81
            48 minutes |          3        0.03       97.84
            50 minutes |         35        0.35       98.19
            55 minutes |          6        0.06       98.25
            57 minutes |          3        0.03       98.28
            58 minutes |          2        0.02       98.30
                1 hour |        110        1.10       99.40
  1 hour and 2 minutes |          1        0.01       99.41
  1 hour and 5 minutes |          7        0.07       99.48
 1 hour and 10 minutes |          4        0.04       99.52
 1 hour and 15 minutes |          9        0.09       99.61
 1 hour and 20 minutes |          3        0.03       99.64
 1 hour and 23 minutes |          2        0.02       99.66
 1 hour and 30 minutes |         18        0.18       99.84
 1 hour and 40 minutes |          4        0.04       99.88
 1 hour and 50 minutes |          1        0.01       99.89
 1 hour and 55 minutes |          1        0.01       99.90
               2 hours |          5        0.05       99.95
2 hours and 10 minutes |          1        0.01       99.96
2 hours and 37 minutes |          1        0.01       99.97
               3 hours |          2        0.02       99.99
               4 hours |          1        0.01      100.00
-----------------------+-----------------------------------
                 Total |     10,000      100.00

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