Frequencies for first 10,000 rows of exp_dt_num variable in drug2009q3 dataset : Expiration | date of the | drug. | (YYYYMMDD) | Freq. Percent Cum. ------------+----------------------------------- 31aug2004 | 1 0.01 0.01 19mar2009 | 1 0.01 0.02 26jun2009 | 1 0.01 0.03 22aug2009 | 1 0.01 0.04 05feb2010 | 1 0.01 0.05 01mar2010 | 1 0.01 0.06 06mar2010 | 1 0.01 0.07 30apr2010 | 1 0.01 0.08 21may2010 | 1 0.01 0.09 02jun2010 | 1 0.01 0.10 10jun2010 | 1 0.01 0.11 24jun2010 | 1 0.01 0.12 30jun2010 | 1 0.01 0.13 01sep2010 | 1 0.01 0.14 30sep2010 | 1 0.01 0.15 01nov2010 | 1 0.01 0.16 30nov2010 | 1 0.01 0.17 31dec2010 | 2 0.02 0.19 01feb2011 | 1 0.01 0.20 28feb2011 | 1 0.01 0.21 29apr2011 | 1 0.01 0.22 26may2011 | 2 0.02 0.24 01jul2011 | 1 0.01 0.25 31aug2011 | 1 0.01 0.26 30sep2011 | 1 0.01 0.27 21dec2011 | 1 0.01 0.28 16jan2012 | 1 0.01 0.29 13feb2012 | 1 0.01 0.30 06mar2012 | 1 0.01 0.31 . | 9,969 99.69 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Dec 2015