Frequencies for first 10,000 rows of timemd variable in namcs1994 dataset :

 duration of visit (in |
              minutes) |      Freq.     Percent        Cum.
-----------------------+-----------------------------------
             0 minutes |        131        1.31        1.31
              1 minute |          1        0.01        1.32
             2 minutes |         37        0.37        1.69
             3 minutes |         19        0.19        1.88
             4 minutes |         56        0.56        2.44
             5 minutes |        325        3.25        5.69
             6 minutes |         75        0.75        6.44
             7 minutes |        116        1.16        7.60
             8 minutes |        155        1.55        9.15
             9 minutes |         44        0.44        9.59
            10 minutes |      1,923       19.23       28.82
            11 minutes |         40        0.40       29.22
            12 minutes |        192        1.92       31.14
            13 minutes |         50        0.50       31.64
            14 minutes |         46        0.46       32.10
            15 minutes |      2,889       28.89       60.99
            16 minutes |         38        0.38       61.37
            17 minutes |         44        0.44       61.81
            18 minutes |         64        0.64       62.45
            19 minutes |         12        0.12       62.57
            20 minutes |      1,731       17.31       79.88
            21 minutes |         12        0.12       80.00
            22 minutes |         21        0.21       80.21
            23 minutes |         14        0.14       80.35
            24 minutes |          9        0.09       80.44
            25 minutes |        397        3.97       84.41
            26 minutes |          5        0.05       84.46
            27 minutes |          3        0.03       84.49
            28 minutes |          8        0.08       84.57
            29 minutes |          1        0.01       84.58
            30 minutes |        878        8.78       93.36
            31 minutes |          1        0.01       93.37
            32 minutes |          3        0.03       93.40
            33 minutes |          1        0.01       93.41
            34 minutes |          2        0.02       93.43
            35 minutes |         80        0.80       94.23
            36 minutes |          5        0.05       94.28
            37 minutes |          4        0.04       94.32
            38 minutes |          3        0.03       94.35
            39 minutes |          1        0.01       94.36
            40 minutes |        119        1.19       95.55
            41 minutes |          1        0.01       95.56
            42 minutes |          1        0.01       95.57
            45 minutes |        197        1.97       97.54
            50 minutes |         53        0.53       98.07
            52 minutes |          1        0.01       98.08
            53 minutes |          2        0.02       98.10
            54 minutes |          1        0.01       98.11
            55 minutes |         13        0.13       98.24
            58 minutes |          1        0.01       98.25
                1 hour |        132        1.32       99.57
  1 hour and 5 minutes |          3        0.03       99.60
  1 hour and 9 minutes |          2        0.02       99.62
 1 hour and 10 minutes |          5        0.05       99.67
 1 hour and 15 minutes |          7        0.07       99.74
 1 hour and 20 minutes |          5        0.05       99.79
 1 hour and 30 minutes |         11        0.11       99.90
 1 hour and 45 minutes |          1        0.01       99.91
               2 hours |          4        0.04       99.95
2 hours and 10 minutes |          1        0.01       99.96
2 hours and 25 minutes |          1        0.01       99.97
2 hours and 30 minutes |          1        0.01       99.98
2 hours and 40 minutes |          1        0.01       99.99
3 hours and 23 minutes |          1        0.01      100.00
-----------------------+-----------------------------------
                 Total |     10,000      100.00

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