Frequencies for first 10,000 rows of exp_dt_num variable in drug2004q3 dataset : Expiration | date of the | drug. | (YYYYMMDD) | Freq. Percent Cum. ------------+----------------------------------- 30jun2003 | 2 0.02 0.02 01aug2003 | 1 0.01 0.03 30sep2003 | 1 0.01 0.04 31oct2003 | 1 0.01 0.05 31dec2003 | 1 0.01 0.06 30mar2004 | 1 0.01 0.07 30apr2004 | 1 0.01 0.08 01may2004 | 1 0.01 0.09 01jun2004 | 1 0.01 0.10 30jun2004 | 1 0.01 0.11 31jul2004 | 2 0.02 0.13 31aug2004 | 1 0.01 0.14 01sep2004 | 7 0.07 0.21 30sep2004 | 1 0.01 0.22 01oct2004 | 2 0.02 0.24 01dec2004 | 2 0.02 0.26 17dec2004 | 1 0.01 0.27 01jan2005 | 2 0.02 0.29 31jan2005 | 2 0.02 0.31 01feb2005 | 3 0.03 0.34 28feb2005 | 1 0.01 0.35 01mar2005 | 2 0.02 0.37 01apr2005 | 3 0.03 0.40 30apr2005 | 3 0.03 0.43 01may2005 | 2 0.02 0.45 31may2005 | 1 0.01 0.46 01jun2005 | 2 0.02 0.48 29jun2005 | 1 0.01 0.49 01jul2005 | 1 0.01 0.50 31jul2005 | 1 0.01 0.51 01aug2005 | 3 0.03 0.54 31aug2005 | 1 0.01 0.55 01sep2005 | 3 0.03 0.58 23sep2005 | 1 0.01 0.59 30sep2005 | 2 0.02 0.61 01oct2005 | 12 0.12 0.73 31oct2005 | 1 0.01 0.74 01nov2005 | 6 0.06 0.80 01dec2005 | 1 0.01 0.81 30dec2005 | 1 0.01 0.82 01jan2006 | 3 0.03 0.85 19jan2006 | 1 0.01 0.86 31jan2006 | 1 0.01 0.87 01feb2006 | 3 0.03 0.90 10feb2006 | 1 0.01 0.91 31mar2006 | 1 0.01 0.92 01may2006 | 1 0.01 0.93 01sep2006 | 1 0.01 0.94 01nov2006 | 1 0.01 0.95 01dec2006 | 1 0.01 0.96 01jan2007 | 1 0.01 0.97 01feb2007 | 1 0.01 0.98 01oct2007 | 1 0.01 0.99 01mar2008 | 1 0.01 1.00 . | 9,900 99.00 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Dec 2015