Frequencies for first 10,000 rows of effective_date variable in nadac20161123 dataset : Effective | Date of the | NADAC Per | Unit Cost | Freq. Percent Cum. ------------+----------------------------------- 01dec2015 | 2 0.02 0.02 23dec2015 | 24 0.24 0.26 01jan2016 | 102 1.02 1.28 05jan2016 | 21 0.21 1.49 06jan2016 | 2 0.02 1.51 09jan2016 | 1 0.01 1.52 15jan2016 | 2 0.02 1.54 20jan2016 | 10 0.10 1.64 05feb2016 | 2 0.02 1.66 17feb2016 | 24 0.24 1.90 26feb2016 | 2 0.02 1.92 21mar2016 | 1 0.01 1.93 23mar2016 | 42 0.42 2.35 24mar2016 | 2 0.02 2.37 01apr2016 | 76 0.76 3.13 02apr2016 | 1 0.01 3.14 04apr2016 | 1 0.01 3.15 11apr2016 | 6 0.06 3.21 13apr2016 | 5 0.05 3.26 20apr2016 | 74 0.74 4.00 21apr2016 | 7 0.07 4.07 02may2016 | 3 0.03 4.10 03may2016 | 10 0.10 4.20 18may2016 | 83 0.83 5.03 26may2016 | 4 0.04 5.07 01jun2016 | 176 1.76 6.83 03jun2016 | 16 0.16 6.99 07jun2016 | 5 0.05 7.04 15jun2016 | 5 0.05 7.09 22jun2016 | 99 0.99 8.08 23jun2016 | 45 0.45 8.53 28jun2016 | 3 0.03 8.56 01jul2016 | 51 0.51 9.07 06jul2016 | 12 0.12 9.19 12jul2016 | 56 0.56 9.75 13jul2016 | 5 0.05 9.80 20jul2016 | 101 1.01 10.81 21jul2016 | 1 0.01 10.82 01aug2016 | 19 0.19 11.01 03aug2016 | 4 0.04 11.05 04aug2016 | 4 0.04 11.09 10aug2016 | 1 0.01 11.10 17aug2016 | 169 1.69 12.79 24aug2016 | 1 0.01 12.80 26aug2016 | 1 0.01 12.81 02sep2016 | 2 0.02 12.83 07sep2016 | 4 0.04 12.87 14sep2016 | 1 0.01 12.88 21sep2016 | 158 1.58 14.46 22sep2016 | 3 0.03 14.49 23sep2016 | 5 0.05 14.54 01oct2016 | 1 0.01 14.55 12oct2016 | 3 0.03 14.58 13oct2016 | 3 0.03 14.61 19oct2016 | 512 5.12 19.73 20oct2016 | 1 0.01 19.74 09nov2016 | 2 0.02 19.76 16nov2016 | 2 0.02 19.78 23nov2016 | 8,022 80.22 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 10 Feb 2018