Frequencies for first 10,000 rows of generic_drug_effectime variable in nadac20160323 dataset :

 Corresponding Generic |
   Drug Effective Date |
              and Time |      Freq.     Percent        Cum.
-----------------------+-----------------------------------
                       |      9,123       91.23       91.23
01/20/2016 12:00:00 AM |          2        0.02       91.25
02/17/2016 12:00:00 AM |         22        0.22       91.47
03/23/2016 12:00:00 AM |        826        8.26       99.73
04/22/2015 12:00:00 AM |          3        0.03       99.76
05/20/2015 12:00:00 AM |          2        0.02       99.78
06/17/2015 12:00:00 AM |          3        0.03       99.81
07/22/2015 12:00:00 AM |          3        0.03       99.84
08/19/2015 12:00:00 AM |          3        0.03       99.87
09/23/2015 12:00:00 AM |          5        0.05       99.92
10/21/2015 12:00:00 AM |          1        0.01       99.93
11/18/2015 12:00:00 AM |          2        0.02       99.95
12/23/2015 12:00:00 AM |          5        0.05      100.00
-----------------------+-----------------------------------
                 Total |     10,000      100.00

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