Frequencies for first 10,000 rows of generic_drug_effectime variable in nadac20161123 dataset : Corresponding Generic | Drug Effective Date | and Time | Freq. Percent Cum. -----------------------+----------------------------------- | 9,157 91.57 91.57 04/20/2016 12:00:00 AM | 1 0.01 91.58 05/18/2016 12:00:00 AM | 4 0.04 91.62 06/22/2016 12:00:00 AM | 1 0.01 91.63 07/20/2016 12:00:00 AM | 3 0.03 91.66 08/17/2016 12:00:00 AM | 2 0.02 91.68 09/21/2016 12:00:00 AM | 5 0.05 91.73 10/19/2016 12:00:00 AM | 9 0.09 91.82 11/23/2016 12:00:00 AM | 816 8.16 99.98 12/23/2015 12:00:00 AM | 2 0.02 100.00 -----------------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 10 Feb 2018