Frequencies for first 10,000 rows of generic_drug_effectime variable in nadac20170802 dataset :

 Corresponding Generic |
   Drug Effective Date |
              and Time |      Freq.     Percent        Cum.
-----------------------+-----------------------------------
                       |      9,185       91.85       91.85
01/18/2017 12:00:00 AM |          1        0.01       91.86
02/22/2017 12:00:00 AM |          6        0.06       91.92
03/22/2017 12:00:00 AM |          8        0.08       92.00
04/19/2017 12:00:00 AM |          2        0.02       92.02
05/17/2017 12:00:00 AM |          4        0.04       92.06
06/21/2017 12:00:00 AM |         17        0.17       92.23
07/19/2017 12:00:00 AM |        762        7.62       99.85
07/20/2016 12:00:00 AM |          1        0.01       99.86
07/26/2017 12:00:00 AM |          2        0.02       99.88
08/02/2017 12:00:00 AM |          2        0.02       99.90
09/21/2016 12:00:00 AM |          1        0.01       99.91
10/19/2016 12:00:00 AM |          1        0.01       99.92
11/23/2016 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