Frequencies for first 10,000 rows of exp_dt_num variable in drug2008q4 dataset : Expiration | date of the | drug. | (YYYYMMDD) | Freq. Percent Cum. ------------+----------------------------------- 06jan2008 | 1 0.01 0.01 01sep2008 | 1 0.01 0.02 10feb2009 | 1 0.01 0.03 07mar2009 | 1 0.01 0.04 11mar2009 | 1 0.01 0.05 01apr2009 | 1 0.01 0.06 02apr2009 | 1 0.01 0.07 04apr2009 | 1 0.01 0.08 06apr2009 | 1 0.01 0.09 30apr2009 | 1 0.01 0.10 01may2009 | 1 0.01 0.11 28may2009 | 1 0.01 0.12 09jun2009 | 1 0.01 0.13 23jun2009 | 1 0.01 0.14 30jun2009 | 1 0.01 0.15 01jul2009 | 1 0.01 0.16 31jul2009 | 1 0.01 0.17 08aug2009 | 1 0.01 0.18 07sep2009 | 1 0.01 0.19 08sep2009 | 1 0.01 0.20 10sep2009 | 1 0.01 0.21 14sep2009 | 1 0.01 0.22 18sep2009 | 1 0.01 0.23 24sep2009 | 1 0.01 0.24 26sep2009 | 1 0.01 0.25 29sep2009 | 1 0.01 0.26 30sep2009 | 4 0.04 0.30 01oct2009 | 2 0.02 0.32 31oct2009 | 1 0.01 0.33 30nov2009 | 1 0.01 0.34 01dec2009 | 1 0.01 0.35 31dec2009 | 1 0.01 0.36 01jan2010 | 1 0.01 0.37 31jan2010 | 3 0.03 0.40 01feb2010 | 3 0.03 0.43 30apr2010 | 1 0.01 0.44 01may2010 | 1 0.01 0.45 31may2010 | 1 0.01 0.46 01jun2010 | 1 0.01 0.47 31jul2010 | 1 0.01 0.48 24aug2010 | 1 0.01 0.49 31aug2010 | 1 0.01 0.50 01sep2010 | 1 0.01 0.51 01oct2010 | 1 0.01 0.52 11oct2010 | 1 0.01 0.53 01nov2010 | 2 0.02 0.55 30nov2010 | 2 0.02 0.57 01dec2010 | 1 0.01 0.58 30dec2010 | 1 0.01 0.59 31dec2010 | 1 0.01 0.60 31jan2011 | 2 0.02 0.62 28feb2011 | 1 0.01 0.63 31mar2011 | 1 0.01 0.64 31aug2011 | 4 0.04 0.68 30sep2011 | 1 0.01 0.69 . | 9,931 99.31 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Dec 2015