Frequencies for first 10,000 rows of exp_dt_num variable in drug2011q1 dataset :

 Expiration |
date of the |
      drug. |
 (YYYYMMDD) |      Freq.     Percent        Cum.
------------+-----------------------------------
  08apr2010 |          2        0.02        0.02
  08feb2011 |          1        0.01        0.03
  01sep2011 |          2        0.02        0.05
  01feb2012 |          1        0.01        0.06
  01apr2012 |          2        0.02        0.08
  31jul2012 |          1        0.01        0.09
  01sep2012 |          1        0.01        0.10
          . |      9,990       99.90      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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