Frequencies for first 10,000 rows of dur variable in ther2013q4 dataset :

   (Mostly) |
    Numeric |
   value of |
        the |
   duration |
(length) of |
    therapy |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          1        0.01        0.01
          2 |          1        0.01        0.02
          3 |          3        0.03        0.05
          5 |          4        0.04        0.09
         11 |          1        0.01        0.10
         38 |          1        0.01        0.11
         45 |          5        0.05        0.16
          . |      9,984       99.84      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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