Frequencies for first 10,000 rows of generic_drug_effectime variable in nadac20160831 dataset : Corresponding Generic | Drug Effective Date | and Time | Freq. Percent Cum. -----------------------+----------------------------------- | 9,155 91.55 91.55 04/20/2016 12:00:00 AM | 1 0.01 91.56 05/18/2016 12:00:00 AM | 14 0.14 91.70 06/22/2016 12:00:00 AM | 5 0.05 91.75 07/20/2016 12:00:00 AM | 11 0.11 91.86 08/17/2016 12:00:00 AM | 805 8.05 99.91 08/24/2016 12:00:00 AM | 6 0.06 99.97 11/18/2015 12:00:00 AM | 1 0.01 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