Frequencies for first 10,000 rows of effective_date variable in nadac20160330 dataset : Effective | Date of the | NADAC Per | Unit Cost | Freq. Percent Cum. ------------+----------------------------------- 27mar2015 | 1 0.01 0.01 01apr2015 | 3 0.03 0.04 03apr2015 | 1 0.01 0.05 16apr2015 | 1 0.01 0.06 22apr2015 | 50 0.50 0.56 23apr2015 | 19 0.19 0.75 24apr2015 | 1 0.01 0.76 01may2015 | 2 0.02 0.78 15may2015 | 2 0.02 0.80 20may2015 | 38 0.38 1.18 29may2015 | 3 0.03 1.21 17jun2015 | 53 0.53 1.74 30jun2015 | 2 0.02 1.76 01jul2015 | 36 0.36 2.12 02jul2015 | 2 0.02 2.14 07jul2015 | 4 0.04 2.18 22jul2015 | 50 0.50 2.68 31jul2015 | 30 0.30 2.98 01aug2015 | 1 0.01 2.99 10aug2015 | 1 0.01 3.00 14aug2015 | 1 0.01 3.01 19aug2015 | 45 0.45 3.46 25aug2015 | 3 0.03 3.49 28aug2015 | 1 0.01 3.50 31aug2015 | 1 0.01 3.51 23sep2015 | 43 0.43 3.94 24sep2015 | 6 0.06 4.00 01oct2015 | 21 0.21 4.21 02oct2015 | 10 0.10 4.31 08oct2015 | 1 0.01 4.32 09oct2015 | 2 0.02 4.34 14oct2015 | 2 0.02 4.36 19oct2015 | 1 0.01 4.37 21oct2015 | 47 0.47 4.84 23oct2015 | 2 0.02 4.86 28oct2015 | 1 0.01 4.87 06nov2015 | 5 0.05 4.92 11nov2015 | 2 0.02 4.94 18nov2015 | 77 0.77 5.71 25nov2015 | 11 0.11 5.82 01dec2015 | 65 0.65 6.47 02dec2015 | 1 0.01 6.48 03dec2015 | 5 0.05 6.53 16dec2015 | 4 0.04 6.57 22dec2015 | 9 0.09 6.66 23dec2015 | 218 2.18 8.84 01jan2016 | 554 5.54 14.38 04jan2016 | 1 0.01 14.39 05jan2016 | 114 1.14 15.53 06jan2016 | 8 0.08 15.61 07jan2016 | 20 0.20 15.81 08jan2016 | 2 0.02 15.83 09jan2016 | 5 0.05 15.88 11jan2016 | 3 0.03 15.91 13jan2016 | 1 0.01 15.92 15jan2016 | 4 0.04 15.96 19jan2016 | 2 0.02 15.98 20jan2016 | 190 1.90 17.88 21jan2016 | 4 0.04 17.92 27jan2016 | 1 0.01 17.93 01feb2016 | 2 0.02 17.95 02feb2016 | 2 0.02 17.97 03feb2016 | 3 0.03 18.00 05feb2016 | 2 0.02 18.02 10feb2016 | 1 0.01 18.03 12feb2016 | 2 0.02 18.05 17feb2016 | 387 3.87 21.92 18feb2016 | 3 0.03 21.95 24feb2016 | 2 0.02 21.97 26feb2016 | 2 0.02 21.99 01mar2016 | 1 0.01 22.00 09mar2016 | 3 0.03 22.03 16mar2016 | 1 0.01 22.04 21mar2016 | 1 0.01 22.05 23mar2016 | 7,773 77.73 99.78 24mar2016 | 9 0.09 99.87 30mar2016 | 13 0.13 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 10 Feb 2018