Frequencies for first 10,000 rows of dur_cod variable in ther2012q4 dataset :

       Unit |
abbreviatio |
      n for |
duration of |
    therapy |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,981       99.81       99.81
        DAY |          8        0.08       99.89
        MON |          9        0.09       99.98
         YR |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Apr 2017