Frequencies for first 10,000 rows of generic_drug_effectime variable in nadac20160106 dataset :

 Corresponding Generic |
   Drug Effective Date |
              and Time |      Freq.     Percent        Cum.
-----------------------+-----------------------------------
                       |      9,090       90.90       90.90
01/06/2016 12:00:00 AM |          3        0.03       90.93
03/18/2015 12:00:00 AM |          4        0.04       90.97
04/22/2015 12:00:00 AM |          3        0.03       91.00
05/20/2015 12:00:00 AM |          2        0.02       91.02
06/17/2015 12:00:00 AM |          3        0.03       91.05
07/22/2015 12:00:00 AM |          4        0.04       91.09
08/19/2015 12:00:00 AM |          4        0.04       91.13
09/23/2015 12:00:00 AM |          6        0.06       91.19
10/21/2015 12:00:00 AM |          6        0.06       91.25
11/11/2015 12:00:00 AM |          1        0.01       91.26
11/18/2015 12:00:00 AM |         22        0.22       91.48
12/23/2015 12:00:00 AM |        851        8.51       99.99
12/30/2016 12:00:00 AM |          1        0.01      100.00
-----------------------+-----------------------------------
                 Total |     10,000      100.00

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