Frequencies for first 10,000 rows of exp_dt_num variable in drug2005q3 dataset : Expiration | date of the | drug. | (YYYYMMDD) | Freq. Percent Cum. ------------+----------------------------------- 01nov2002 | 4 0.04 0.04 05sep2004 | 4 0.04 0.08 31oct2004 | 1 0.01 0.09 29nov2004 | 4 0.04 0.13 16dec2004 | 4 0.04 0.17 07jan2005 | 1 0.01 0.18 31jan2005 | 1 0.01 0.19 08feb2005 | 4 0.04 0.23 19apr2005 | 4 0.04 0.27 03may2005 | 4 0.04 0.31 10may2005 | 4 0.04 0.35 22may2005 | 4 0.04 0.39 31may2005 | 1 0.01 0.40 19jun2005 | 4 0.04 0.44 18jul2005 | 1 0.01 0.45 01aug2005 | 1 0.01 0.46 12aug2005 | 2 0.02 0.48 31aug2005 | 2 0.02 0.50 01sep2005 | 3 0.03 0.53 30nov2005 | 1 0.01 0.54 01jan2006 | 1 0.01 0.55 01feb2006 | 1 0.01 0.56 28feb2006 | 1 0.01 0.57 17mar2006 | 1 0.01 0.58 31mar2006 | 3 0.03 0.61 22apr2006 | 1 0.01 0.62 01may2006 | 1 0.01 0.63 24may2006 | 1 0.01 0.64 31may2006 | 1 0.01 0.65 01jul2006 | 1 0.01 0.66 31jul2006 | 3 0.03 0.69 01aug2006 | 1 0.01 0.70 04aug2006 | 2 0.02 0.72 31aug2006 | 1 0.01 0.73 01sep2006 | 4 0.04 0.77 01oct2006 | 2 0.02 0.79 07oct2006 | 1 0.01 0.80 23nov2006 | 2 0.02 0.82 01dec2006 | 2 0.02 0.84 07jan2007 | 3 0.03 0.87 31jan2007 | 1 0.01 0.88 01feb2007 | 1 0.01 0.89 28feb2007 | 1 0.01 0.90 01mar2007 | 1 0.01 0.91 22mar2007 | 1 0.01 0.92 18apr2007 | 1 0.01 0.93 31may2007 | 1 0.01 0.94 04jun2007 | 2 0.02 0.96 30jun2007 | 1 0.01 0.97 31jul2007 | 1 0.01 0.98 01aug2007 | 2 0.02 1.00 25aug2007 | 1 0.01 1.01 30sep2007 | 1 0.01 1.02 17oct2007 | 1 0.01 1.03 31oct2007 | 1 0.01 1.04 01jan2008 | 2 0.02 1.06 31aug2008 | 1 0.01 1.07 . | 9,893 98.93 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Dec 2015