Frequencies for first 10,000 rows of exp_dt_num variable in drug2007q3 dataset : Expiration | date of the | drug. | (YYYYMMDD) | Freq. Percent Cum. ------------+----------------------------------- 01oct2004 | 1 0.01 0.01 31oct2005 | 1 0.01 0.02 01dec2005 | 1 0.01 0.03 01jun2007 | 2 0.02 0.05 02jun2007 | 1 0.01 0.06 19jun2007 | 1 0.01 0.07 10jul2007 | 1 0.01 0.08 01sep2007 | 1 0.01 0.09 31oct2007 | 1 0.01 0.10 28nov2007 | 1 0.01 0.11 01dec2007 | 1 0.01 0.12 01jan2008 | 1 0.01 0.13 24jan2008 | 1 0.01 0.14 31jan2008 | 1 0.01 0.15 01mar2008 | 1 0.01 0.16 20mar2008 | 1 0.01 0.17 31mar2008 | 1 0.01 0.18 01apr2008 | 2 0.02 0.20 30apr2008 | 8 0.08 0.28 01may2008 | 1 0.01 0.29 02may2008 | 1 0.01 0.30 09may2008 | 1 0.01 0.31 31may2008 | 2 0.02 0.33 01jun2008 | 1 0.01 0.34 02jun2008 | 2 0.02 0.36 05jun2008 | 1 0.01 0.37 06jun2008 | 1 0.01 0.38 25jun2008 | 1 0.01 0.39 30jun2008 | 2 0.02 0.41 01jul2008 | 2 0.02 0.43 31aug2008 | 1 0.01 0.44 01oct2008 | 1 0.01 0.45 01nov2008 | 1 0.01 0.46 30nov2008 | 2 0.02 0.48 01mar2009 | 1 0.01 0.49 31may2009 | 1 0.01 0.50 31aug2009 | 2 0.02 0.52 30sep2009 | 1 0.01 0.53 10oct2009 | 1 0.01 0.54 31oct2009 | 1 0.01 0.55 01nov2009 | 1 0.01 0.56 31dec2009 | 1 0.01 0.57 31may2010 | 1 0.01 0.58 14jun2012 | 1 0.01 0.59 12jun2014 | 1 0.01 0.60 . | 9,940 99.40 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Dec 2015