Frequencies for first 10,000 rows of effective_date variable in nadac20170802 dataset : Effective | Date of the | NADAC Per | Unit Cost | Freq. Percent Cum. ------------+----------------------------------- 20jul2016 | 31 0.31 0.31 10aug2016 | 1 0.01 0.32 17aug2016 | 45 0.45 0.77 21sep2016 | 23 0.23 1.00 23sep2016 | 1 0.01 1.01 01oct2016 | 1 0.01 1.02 12oct2016 | 1 0.01 1.03 13oct2016 | 3 0.03 1.06 19oct2016 | 74 0.74 1.80 09nov2016 | 1 0.01 1.81 23nov2016 | 52 0.52 2.33 01dec2016 | 2 0.02 2.35 14dec2016 | 4 0.04 2.39 21dec2016 | 68 0.68 3.07 26dec2016 | 13 0.13 3.20 31dec2016 | 7 0.07 3.27 01jan2017 | 142 1.42 4.69 02jan2017 | 2 0.02 4.71 04jan2017 | 38 0.38 5.09 06jan2017 | 18 0.18 5.27 09jan2017 | 2 0.02 5.29 16jan2017 | 1 0.01 5.30 18jan2017 | 78 0.78 6.08 19jan2017 | 1 0.01 6.09 23jan2017 | 2 0.02 6.11 17feb2017 | 1 0.01 6.12 22feb2017 | 324 3.24 9.36 23feb2017 | 2 0.02 9.38 02mar2017 | 1 0.01 9.39 08mar2017 | 3 0.03 9.42 15mar2017 | 1 0.01 9.43 17mar2017 | 1 0.01 9.44 22mar2017 | 155 1.55 10.99 23mar2017 | 3 0.03 11.02 29mar2017 | 2 0.02 11.04 01apr2017 | 3 0.03 11.07 03apr2017 | 4 0.04 11.11 07apr2017 | 4 0.04 11.15 12apr2017 | 2 0.02 11.17 19apr2017 | 115 1.15 12.32 24apr2017 | 11 0.11 12.43 26apr2017 | 1 0.01 12.44 02may2017 | 5 0.05 12.49 03may2017 | 3 0.03 12.52 10may2017 | 2 0.02 12.54 16may2017 | 1 0.01 12.55 17may2017 | 194 1.94 14.49 31may2017 | 3 0.03 14.52 01jun2017 | 149 1.49 16.01 07jun2017 | 3 0.03 16.04 08jun2017 | 17 0.17 16.21 21jun2017 | 255 2.55 18.76 28jun2017 | 1 0.01 18.77 01jul2017 | 8 0.08 18.85 03jul2017 | 1 0.01 18.86 05jul2017 | 7 0.07 18.93 06jul2017 | 2 0.02 18.95 11jul2017 | 87 0.87 19.82 12jul2017 | 10 0.10 19.92 14jul2017 | 1 0.01 19.93 19jul2017 | 7,964 79.64 99.57 20jul2017 | 2 0.02 99.59 26jul2017 | 14 0.14 99.73 02aug2017 | 27 0.27 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 10 Feb 2018