Frequencies for first 10,000 rows of exp_dt_num variable in drug2006q1 dataset : Expiration | date of the | drug. | (YYYYMMDD) | Freq. Percent Cum. ------------+----------------------------------- 30jun2005 | 1 0.01 0.01 31jul2005 | 1 0.01 0.02 01oct2005 | 5 0.05 0.07 01nov2005 | 1 0.01 0.08 30nov2005 | 1 0.01 0.09 01feb2006 | 3 0.03 0.12 01apr2006 | 1 0.01 0.13 01jun2006 | 1 0.01 0.14 30jun2006 | 1 0.01 0.15 01jul2006 | 2 0.02 0.17 31aug2006 | 1 0.01 0.18 01sep2006 | 1 0.01 0.19 30sep2006 | 1 0.01 0.20 01oct2006 | 1 0.01 0.21 07oct2006 | 1 0.01 0.22 01nov2006 | 1 0.01 0.23 08nov2006 | 1 0.01 0.24 11nov2006 | 1 0.01 0.25 18nov2006 | 1 0.01 0.26 30nov2006 | 1 0.01 0.27 31dec2006 | 2 0.02 0.29 01jan2007 | 2 0.02 0.31 01feb2007 | 2 0.02 0.33 28feb2007 | 1 0.01 0.34 31mar2007 | 2 0.02 0.36 01apr2007 | 2 0.02 0.38 30apr2007 | 2 0.02 0.40 01may2007 | 3 0.03 0.43 31may2007 | 1 0.01 0.44 01jun2007 | 1 0.01 0.45 01aug2007 | 1 0.01 0.46 31aug2007 | 2 0.02 0.48 01oct2007 | 1 0.01 0.49 29feb2008 | 1 0.01 0.50 01may2008 | 1 0.01 0.51 31dec2008 | 1 0.01 0.52 31mar2010 | 1 0.01 0.53 . | 9,947 99.47 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Dec 2015