Frequencies for first 10,000 rows of generic_drug_effectime variable in nadac20170614 dataset :

 Corresponding Generic |
   Drug Effective Date |
              and Time |      Freq.     Percent        Cum.
-----------------------+-----------------------------------
                       |      9,175       91.75       91.75
01/18/2017 12:00:00 AM |          3        0.03       91.78
02/08/2017 12:00:00 AM |          1        0.01       91.79
02/22/2017 12:00:00 AM |          7        0.07       91.86
03/22/2017 12:00:00 AM |         11        0.11       91.97
04/19/2017 12:00:00 AM |         13        0.13       92.10
05/17/2017 12:00:00 AM |        769        7.69       99.79
05/18/2016 12:00:00 AM |          4        0.04       99.83
05/31/2017 12:00:00 AM |          1        0.01       99.84
06/07/2017 12:00:00 AM |          1        0.01       99.85
06/22/2016 12:00:00 AM |          1        0.01       99.86
07/20/2016 12:00:00 AM |          1        0.01       99.87
08/17/2016 12:00:00 AM |          1        0.01       99.88
09/21/2016 12:00:00 AM |          1        0.01       99.89
10/19/2016 12:00:00 AM |          1        0.01       99.90
11/23/2016 12:00:00 AM |          3        0.03       99.93
12/21/2016 12:00:00 AM |          7        0.07      100.00
-----------------------+-----------------------------------
                 Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 10 Feb 2018