Frequencies for first 10,000 rows of generic_drug_effectime variable in nadac20170913 dataset :

 Corresponding Generic |
   Drug Effective Date |
              and Time |      Freq.     Percent        Cum.
-----------------------+-----------------------------------
                       |      9,189       91.89       91.89
01/18/2017 12:00:00 AM |          1        0.01       91.90
02/22/2017 12:00:00 AM |          6        0.06       91.96
03/22/2017 12:00:00 AM |          1        0.01       91.97
04/19/2017 12:00:00 AM |          1        0.01       91.98
05/17/2017 12:00:00 AM |          1        0.01       91.99
06/21/2017 12:00:00 AM |          6        0.06       92.05
07/19/2017 12:00:00 AM |         24        0.24       92.29
08/23/2017 12:00:00 AM |        761        7.61       99.90
09/13/2017 12:00:00 AM |          1        0.01       99.91
09/21/2016 12:00:00 AM |          1        0.01       99.92
10/19/2016 12:00:00 AM |          1        0.01       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