Frequencies for first 10,000 rows of dur_cod variable in ther2013q3 dataset :

       Unit |
abbreviatio |
      n for |
duration of |
    therapy |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,983       99.83       99.83
        DAY |         13        0.13       99.96
        MON |          1        0.01       99.97
         YR |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 6 Apr 2017