Frequencies for first 10,000 rows of effective_date variable in nadac20160831 dataset : Effective | Date of the | NADAC Per | Unit Cost | Freq. Percent Cum. ------------+----------------------------------- 19aug2015 | 11 0.11 0.11 28aug2015 | 1 0.01 0.12 23sep2015 | 7 0.07 0.19 02oct2015 | 1 0.01 0.20 09oct2015 | 1 0.01 0.21 21oct2015 | 11 0.11 0.32 23oct2015 | 2 0.02 0.34 06nov2015 | 3 0.03 0.37 18nov2015 | 26 0.26 0.63 01dec2015 | 22 0.22 0.85 16dec2015 | 2 0.02 0.87 22dec2015 | 6 0.06 0.93 23dec2015 | 88 0.88 1.81 01jan2016 | 242 2.42 4.23 05jan2016 | 32 0.32 4.55 06jan2016 | 3 0.03 4.58 07jan2016 | 13 0.13 4.71 08jan2016 | 1 0.01 4.72 09jan2016 | 5 0.05 4.77 11jan2016 | 3 0.03 4.80 15jan2016 | 3 0.03 4.83 20jan2016 | 31 0.31 5.14 01feb2016 | 2 0.02 5.16 03feb2016 | 1 0.01 5.17 05feb2016 | 2 0.02 5.19 17feb2016 | 53 0.53 5.72 26feb2016 | 2 0.02 5.74 21mar2016 | 1 0.01 5.75 23mar2016 | 61 0.61 6.36 24mar2016 | 9 0.09 6.45 30mar2016 | 1 0.01 6.46 01apr2016 | 80 0.80 7.26 02apr2016 | 1 0.01 7.27 04apr2016 | 1 0.01 7.28 11apr2016 | 6 0.06 7.34 13apr2016 | 5 0.05 7.39 20apr2016 | 100 1.00 8.39 21apr2016 | 8 0.08 8.47 02may2016 | 3 0.03 8.50 03may2016 | 10 0.10 8.60 18may2016 | 131 1.31 9.91 26may2016 | 4 0.04 9.95 01jun2016 | 191 1.91 11.86 02jun2016 | 2 0.02 11.88 03jun2016 | 16 0.16 12.04 07jun2016 | 5 0.05 12.09 15jun2016 | 6 0.06 12.15 22jun2016 | 168 1.68 13.83 23jun2016 | 49 0.49 14.32 28jun2016 | 3 0.03 14.35 29jun2016 | 1 0.01 14.36 01jul2016 | 57 0.57 14.93 06jul2016 | 13 0.13 15.06 12jul2016 | 85 0.85 15.91 13jul2016 | 18 0.18 16.09 20jul2016 | 313 3.13 19.22 21jul2016 | 1 0.01 19.23 03aug2016 | 5 0.05 19.28 04aug2016 | 4 0.04 19.32 10aug2016 | 3 0.03 19.35 12aug2016 | 2 0.02 19.37 17aug2016 | 8,045 80.45 99.82 24aug2016 | 15 0.15 99.97 26aug2016 | 1 0.01 99.98 31aug2016 | 2 0.02 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 10 Feb 2018