Frequencies for first 10,000 rows of dur_cod variable in ther2004q3 dataset :

       Unit |
abbreviatio |
      n for |
duration of |
    therapy |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,523       95.23       95.23
        DAY |        261        2.61       97.84
         HR |         18        0.18       98.02
        MIN |         10        0.10       98.12
        MON |         77        0.77       98.89
        SEC |          1        0.01       98.90
         WK |         77        0.77       99.67
         YR |         33        0.33      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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