Frequencies for first 10,000 rows of exp_dt variable in drug2006q3 dataset :

 Expiration |
date of the |
      drug. |
  (YYYYMMDD |
    format) |      Freq.     Percent        Cum.
------------+-----------------------------------
   2.00e+07 |          1        0.01        0.01
   2.01e+07 |          1        0.01        0.02
   2.01e+07 |          2        0.02        0.04
   2.01e+07 |          2        0.02        0.06
   2.01e+07 |          1        0.01        0.07
   2.01e+07 |          1        0.01        0.08
   2.01e+07 |          1        0.01        0.09
   2.01e+07 |          2        0.02        0.11
   2.01e+07 |          1        0.01        0.12
   2.01e+07 |          1        0.01        0.13
   2.01e+07 |          1        0.01        0.14
   2.01e+07 |          1        0.01        0.15
   2.01e+07 |          2        0.02        0.17
   2.01e+07 |          4        0.04        0.21
   2.01e+07 |          1        0.01        0.22
   2.01e+07 |          1        0.01        0.23
   2.01e+07 |          1        0.01        0.24
   2.01e+07 |          1        0.01        0.25
   2.01e+07 |          5        0.05        0.30
   2.01e+07 |          1        0.01        0.31
   2.01e+07 |          2        0.02        0.33
   2.01e+07 |          8        0.08        0.41
   2.01e+07 |          1        0.01        0.42
   2.01e+07 |          1        0.01        0.43
   2.01e+07 |          3        0.03        0.46
   2.01e+07 |          2        0.02        0.48
   2.01e+07 |          1        0.01        0.49
   2.01e+07 |          1        0.01        0.50
   2.01e+07 |          1        0.01        0.51
   2.01e+07 |          1        0.01        0.52
   2.01e+07 |          1        0.01        0.53
   2.01e+07 |          1        0.01        0.54
   2.01e+07 |          1        0.01        0.55
   2.01e+07 |          1        0.01        0.56
   2.01e+07 |          1        0.01        0.57
   2.01e+07 |          1        0.01        0.58
   2.01e+07 |          1        0.01        0.59
   2.01e+07 |          1        0.01        0.60
          . |      9,940       99.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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