Frequencies for first 10,000 rows of dur_cod variable in ther2004q1 dataset :

       Unit |
abbreviatio |
      n for |
duration of |
    therapy |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,448       94.48       94.48
        DAY |        307        3.07       97.55
         HR |         65        0.65       98.20
        MIN |          1        0.01       98.21
        MON |         77        0.77       98.98
         WK |         56        0.56       99.54
         YR |         46        0.46      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Dec 2015