Frequencies for first 10,000 rows of effective_date variable in psfsnf201404 dataset : Effective | Date | Freq. Percent Cum. ------------+----------------------------------- 29jun1902 | 1 0.01 0.01 30may1903 | 1 0.01 0.02 29jun1903 | 1 0.01 0.03 14mar1993 | 1 0.01 0.04 28apr1996 | 1 0.01 0.05 19apr1997 | 1 0.01 0.06 31oct1997 | 1 0.01 0.07 01jul1998 | 254 2.54 2.61 02jul1998 | 9 0.09 2.70 09jul1998 | 1 0.01 2.71 20jul1998 | 1 0.01 2.72 01aug1998 | 8 0.08 2.80 02aug1998 | 6 0.06 2.86 08aug1998 | 1 0.01 2.87 11aug1998 | 1 0.01 2.88 24aug1998 | 1 0.01 2.89 30aug1998 | 1 0.01 2.90 01sep1998 | 17 0.17 3.07 02sep1998 | 3 0.03 3.10 03sep1998 | 1 0.01 3.11 11sep1998 | 1 0.01 3.12 17sep1998 | 1 0.01 3.13 28sep1998 | 1 0.01 3.14 29sep1998 | 3 0.03 3.17 01oct1998 | 74 0.74 3.91 02oct1998 | 1 0.01 3.92 03oct1998 | 1 0.01 3.93 23oct1998 | 1 0.01 3.94 01nov1998 | 8 0.08 4.02 06nov1998 | 1 0.01 4.03 12nov1998 | 1 0.01 4.04 14nov1998 | 1 0.01 4.05 19nov1998 | 1 0.01 4.06 01dec1998 | 5 0.05 4.11 18dec1998 | 1 0.01 4.12 24dec1998 | 1 0.01 4.13 30dec1998 | 4 0.04 4.17 01jan1999 | 464 4.64 8.81 02jan1999 | 6 0.06 8.87 15jan1999 | 1 0.01 8.88 01feb1999 | 9 0.09 8.97 22feb1999 | 1 0.01 8.98 27feb1999 | 1 0.01 8.99 01mar1999 | 5 0.05 9.04 11mar1999 | 1 0.01 9.05 18mar1999 | 1 0.01 9.06 26mar1999 | 1 0.01 9.07 01apr1999 | 30 0.30 9.37 02apr1999 | 1 0.01 9.38 29apr1999 | 1 0.01 9.39 01may1999 | 10 0.10 9.49 03may1999 | 2 0.02 9.51 04may1999 | 1 0.01 9.52 31may1999 | 1 0.01 9.53 01jun1999 | 25 0.25 9.78 07jun1999 | 1 0.01 9.79 08jun1999 | 1 0.01 9.80 09jun1999 | 1 0.01 9.81 22jun1999 | 3 0.03 9.84 01jul1999 | 240 2.40 12.24 02jul1999 | 5 0.05 12.29 08jul1999 | 1 0.01 12.30 14jul1999 | 1 0.01 12.31 21jul1999 | 1 0.01 12.32 29jul1999 | 1 0.01 12.33 01aug1999 | 5 0.05 12.38 23aug1999 | 1 0.01 12.39 31aug1999 | 5 0.05 12.44 01sep1999 | 34 0.34 12.78 02sep1999 | 1 0.01 12.79 08sep1999 | 1 0.01 12.80 21sep1999 | 1 0.01 12.81 28sep1999 | 1 0.01 12.82 29sep1999 | 1 0.01 12.83 01oct1999 | 161 1.61 14.44 02oct1999 | 1 0.01 14.45 12oct1999 | 2 0.02 14.47 19oct1999 | 1 0.01 14.48 01nov1999 | 14 0.14 14.62 05nov1999 | 1 0.01 14.63 18nov1999 | 1 0.01 14.64 23nov1999 | 1 0.01 14.65 28nov1999 | 1 0.01 14.66 01dec1999 | 4 0.04 14.70 06dec1999 | 1 0.01 14.71 15dec1999 | 1 0.01 14.72 16dec1999 | 1 0.01 14.73 28dec1999 | 1 0.01 14.74 01jan2000 | 437 4.37 19.11 02jan2000 | 24 0.24 19.35 18jan2000 | 1 0.01 19.36 25jan2000 | 1 0.01 19.37 31jan2000 | 2 0.02 19.39 01feb2000 | 10 0.10 19.49 15feb2000 | 2 0.02 19.51 29feb2000 | 2 0.02 19.53 01mar2000 | 16 0.16 19.69 03mar2000 | 4 0.04 19.73 06mar2000 | 3 0.03 19.76 09mar2000 | 1 0.01 19.77 01apr2000 | 22 0.22 19.99 29apr2000 | 1 0.01 20.00 01may2000 | 10 0.10 20.10 02may2000 | 1 0.01 20.11 03may2000 | 1 0.01 20.12 18may2000 | 1 0.01 20.13 22may2000 | 2 0.02 20.15 25may2000 | 1 0.01 20.16 30may2000 | 2 0.02 20.18 01jun2000 | 21 0.21 20.39 30jun2000 | 2 0.02 20.41 01jul2000 | 225 2.25 22.66 02jul2000 | 5 0.05 22.71 03jul2000 | 1 0.01 22.72 08jul2000 | 1 0.01 22.73 10jul2000 | 1 0.01 22.74 29jul2000 | 1 0.01 22.75 01aug2000 | 7 0.07 22.82 02aug2000 | 4 0.04 22.86 15aug2000 | 1 0.01 22.87 31aug2000 | 1 0.01 22.88 01sep2000 | 13 0.13 23.01 02sep2000 | 1 0.01 23.02 06sep2000 | 1 0.01 23.03 19sep2000 | 1 0.01 23.04 20sep2000 | 1 0.01 23.05 22sep2000 | 1 0.01 23.06 27sep2000 | 1 0.01 23.07 29sep2000 | 1 0.01 23.08 01oct2000 | 149 1.49 24.57 02oct2000 | 1 0.01 24.58 11oct2000 | 1 0.01 24.59 25oct2000 | 1 0.01 24.60 01nov2000 | 7 0.07 24.67 15nov2000 | 2 0.02 24.69 16nov2000 | 1 0.01 24.70 29nov2000 | 3 0.03 24.73 01dec2000 | 7 0.07 24.80 04dec2000 | 1 0.01 24.81 16dec2000 | 1 0.01 24.82 18dec2000 | 1 0.01 24.83 30dec2000 | 5 0.05 24.88 01jan2001 | 318 3.18 28.06 02jan2001 | 2 0.02 28.08 03jan2001 | 2 0.02 28.10 04jan2001 | 1 0.01 28.11 16jan2001 | 1 0.01 28.12 01feb2001 | 3 0.03 28.15 01mar2001 | 3 0.03 28.18 16mar2001 | 2 0.02 28.20 17mar2001 | 1 0.01 28.21 20mar2001 | 1 0.01 28.22 01apr2001 | 9 0.09 28.31 03apr2001 | 1 0.01 28.32 19apr2001 | 1 0.01 28.33 30apr2001 | 1 0.01 28.34 01may2001 | 6 0.06 28.40 09may2001 | 1 0.01 28.41 11may2001 | 2 0.02 28.43 31may2001 | 1 0.01 28.44 01jun2001 | 10 0.10 28.54 15jun2001 | 1 0.01 28.55 27jun2001 | 1 0.01 28.56 01jul2001 | 180 1.80 30.36 16jul2001 | 1 0.01 30.37 26jul2001 | 1 0.01 30.38 01aug2001 | 4 0.04 30.42 23aug2001 | 1 0.01 30.43 31aug2001 | 1 0.01 30.44 01sep2001 | 10 0.10 30.54 21sep2001 | 2 0.02 30.56 22sep2001 | 1 0.01 30.57 29sep2001 | 1 0.01 30.58 01oct2001 | 186 1.86 32.44 15oct2001 | 1 0.01 32.45 30oct2001 | 3 0.03 32.48 31oct2001 | 1 0.01 32.49 01nov2001 | 9 0.09 32.58 26nov2001 | 1 0.01 32.59 18dec2001 | 1 0.01 32.60 30dec2001 | 2 0.02 32.62 01jan2002 | 283 2.83 35.45 11jan2002 | 2 0.02 35.47 15jan2002 | 1 0.01 35.48 29jan2002 | 1 0.01 35.49 01feb2002 | 3 0.03 35.52 23mar2002 | 2 0.02 35.54 01apr2002 | 6 0.06 35.60 04apr2002 | 1 0.01 35.61 01may2002 | 1 0.01 35.62 01jun2002 | 3 0.03 35.65 12jun2002 | 2 0.02 35.67 14jun2002 | 1 0.01 35.68 29jun2002 | 1 0.01 35.69 01jul2002 | 108 1.08 36.77 02jul2002 | 1 0.01 36.78 15jul2002 | 1 0.01 36.79 30jul2002 | 2 0.02 36.81 31jul2002 | 1 0.01 36.82 01aug2002 | 3 0.03 36.85 01sep2002 | 4 0.04 36.89 17sep2002 | 1 0.01 36.90 19sep2002 | 1 0.01 36.91 29sep2002 | 4 0.04 36.95 01oct2002 | 187 1.87 38.82 03oct2002 | 1 0.01 38.83 31oct2002 | 1 0.01 38.84 01nov2002 | 4 0.04 38.88 26nov2002 | 1 0.01 38.89 01dec2002 | 2 0.02 38.91 12dec2002 | 1 0.01 38.92 30dec2002 | 2 0.02 38.94 01jan2003 | 150 1.50 40.44 21jan2003 | 1 0.01 40.45 01feb2003 | 2 0.02 40.47 05feb2003 | 1 0.01 40.48 26feb2003 | 1 0.01 40.49 18mar2003 | 1 0.01 40.50 19mar2003 | 1 0.01 40.51 01apr2003 | 8 0.08 40.59 03apr2003 | 1 0.01 40.60 04apr2003 | 1 0.01 40.61 14apr2003 | 1 0.01 40.62 15apr2003 | 2 0.02 40.64 30apr2003 | 1 0.01 40.65 01may2003 | 5 0.05 40.70 16may2003 | 1 0.01 40.71 31may2003 | 1 0.01 40.72 01jun2003 | 4 0.04 40.76 02jun2003 | 1 0.01 40.77 16jun2003 | 1 0.01 40.78 19jun2003 | 1 0.01 40.79 30jun2003 | 2 0.02 40.81 01jul2003 | 112 1.12 41.93 02jul2003 | 1 0.01 41.94 10jul2003 | 1 0.01 41.95 16jul2003 | 1 0.01 41.96 17jul2003 | 1 0.01 41.97 31jul2003 | 1 0.01 41.98 01aug2003 | 1 0.01 41.99 06aug2003 | 1 0.01 42.00 15aug2003 | 1 0.01 42.01 22aug2003 | 2 0.02 42.03 31aug2003 | 1 0.01 42.04 01sep2003 | 12 0.12 42.16 16sep2003 | 1 0.01 42.17 29sep2003 | 2 0.02 42.19 30sep2003 | 1 0.01 42.20 01oct2003 | 162 1.62 43.82 10oct2003 | 1 0.01 43.83 23oct2003 | 1 0.01 43.84 31oct2003 | 2 0.02 43.86 01nov2003 | 27 0.27 44.13 06nov2003 | 1 0.01 44.14 16nov2003 | 1 0.01 44.15 29nov2003 | 2 0.02 44.17 01dec2003 | 9 0.09 44.26 12dec2003 | 1 0.01 44.27 26dec2003 | 2 0.02 44.29 01jan2004 | 150 1.50 45.79 17jan2004 | 1 0.01 45.80 01apr2004 | 23 0.23 46.03 02apr2004 | 1 0.01 46.04 22apr2004 | 1 0.01 46.05 01may2004 | 2 0.02 46.07 31may2004 | 1 0.01 46.08 11jun2004 | 1 0.01 46.09 13jun2004 | 1 0.01 46.10 26jun2004 | 1 0.01 46.11 28jun2004 | 1 0.01 46.12 01jul2004 | 101 1.01 47.13 07jul2004 | 1 0.01 47.14 19jul2004 | 1 0.01 47.15 20jul2004 | 1 0.01 47.16 30jul2004 | 1 0.01 47.17 01aug2004 | 2 0.02 47.19 12aug2004 | 1 0.01 47.20 01sep2004 | 4 0.04 47.24 15sep2004 | 1 0.01 47.25 29sep2004 | 2 0.02 47.27 01oct2004 | 163 1.63 48.90 15oct2004 | 1 0.01 48.91 01nov2004 | 4 0.04 48.95 15nov2004 | 1 0.01 48.96 15dec2004 | 1 0.01 48.97 01jan2005 | 113 1.13 50.10 12feb2005 | 1 0.01 50.11 28feb2005 | 1 0.01 50.12 01mar2005 | 4 0.04 50.16 15mar2005 | 1 0.01 50.17 31mar2005 | 2 0.02 50.19 01apr2005 | 4 0.04 50.23 30apr2005 | 1 0.01 50.24 01may2005 | 1 0.01 50.25 02may2005 | 1 0.01 50.26 09may2005 | 1 0.01 50.27 17may2005 | 1 0.01 50.28 20may2005 | 1 0.01 50.29 30may2005 | 1 0.01 50.30 31may2005 | 4 0.04 50.34 01jul2005 | 97 0.97 51.31 15jul2005 | 1 0.01 51.32 16jul2005 | 1 0.01 51.33 19jul2005 | 3 0.03 51.36 20jul2005 | 2 0.02 51.38 22jul2005 | 1 0.01 51.39 25jul2005 | 1 0.01 51.40 28jul2005 | 1 0.01 51.41 31jul2005 | 1 0.01 51.42 01aug2005 | 3 0.03 51.45 04aug2005 | 1 0.01 51.46 30aug2005 | 3 0.03 51.49 01sep2005 | 6 0.06 51.55 23sep2005 | 1 0.01 51.56 30sep2005 | 1 0.01 51.57 01oct2005 | 906 9.06 60.63 02oct2005 | 3 0.03 60.66 03oct2005 | 1 0.01 60.67 28oct2005 | 1 0.01 60.68 01nov2005 | 2 0.02 60.70 03nov2005 | 1 0.01 60.71 26dec2005 | 3 0.03 60.74 01jan2006 | 115 1.15 61.89 11jan2006 | 1 0.01 61.90 11feb2006 | 1 0.01 61.91 13feb2006 | 1 0.01 61.92 22feb2006 | 1 0.01 61.93 30mar2006 | 1 0.01 61.94 01apr2006 | 3 0.03 61.97 26apr2006 | 1 0.01 61.98 30apr2006 | 1 0.01 61.99 01may2006 | 2 0.02 62.01 05may2006 | 1 0.01 62.02 07jun2006 | 1 0.01 62.03 01jul2006 | 110 1.10 63.13 25jul2006 | 1 0.01 63.14 30jul2006 | 1 0.01 63.15 01aug2006 | 3 0.03 63.18 04aug2006 | 1 0.01 63.19 29aug2006 | 1 0.01 63.20 31aug2006 | 1 0.01 63.21 01sep2006 | 4 0.04 63.25 04sep2006 | 1 0.01 63.26 08sep2006 | 1 0.01 63.27 29sep2006 | 1 0.01 63.28 01oct2006 | 919 9.19 72.47 02oct2006 | 11 0.11 72.58 20oct2006 | 1 0.01 72.59 30oct2006 | 1 0.01 72.60 01nov2006 | 3 0.03 72.63 02nov2006 | 1 0.01 72.64 12nov2006 | 1 0.01 72.65 16nov2006 | 1 0.01 72.66 28nov2006 | 1 0.01 72.67 21dec2006 | 1 0.01 72.68 01jan2007 | 115 1.15 73.83 24jan2007 | 1 0.01 73.84 01feb2007 | 1 0.01 73.85 16feb2007 | 1 0.01 73.86 01mar2007 | 3 0.03 73.89 01apr2007 | 3 0.03 73.92 06apr2007 | 1 0.01 73.93 16apr2007 | 1 0.01 73.94 01may2007 | 3 0.03 73.97 07may2007 | 1 0.01 73.98 16may2007 | 2 0.02 74.00 16jun2007 | 1 0.01 74.01 27jun2007 | 1 0.01 74.02 01jul2007 | 93 0.93 74.95 16jul2007 | 4 0.04 74.99 01aug2007 | 9 0.09 75.08 16aug2007 | 1 0.01 75.09 01sep2007 | 2 0.02 75.11 16sep2007 | 1 0.01 75.12 20sep2007 | 1 0.01 75.13 01oct2007 | 244 2.44 77.57 02oct2007 | 1 0.01 77.58 18oct2007 | 1 0.01 77.59 01nov2007 | 2 0.02 77.61 16nov2007 | 1 0.01 77.62 01dec2007 | 1 0.01 77.63 21dec2007 | 1 0.01 77.64 01jan2008 | 122 1.22 78.86 15jan2008 | 1 0.01 78.87 16jan2008 | 1 0.01 78.88 01feb2008 | 1 0.01 78.89 16feb2008 | 1 0.01 78.90 01apr2008 | 4 0.04 78.94 08apr2008 | 1 0.01 78.95 10apr2008 | 1 0.01 78.96 29apr2008 | 1 0.01 78.97 01may2008 | 1 0.01 78.98 29may2008 | 1 0.01 78.99 30may2008 | 1 0.01 79.00 01jun2008 | 1 0.01 79.01 19jun2008 | 1 0.01 79.02 01jul2008 | 19 0.19 79.21 06jul2008 | 1 0.01 79.22 16jul2008 | 3 0.03 79.25 01aug2008 | 3 0.03 79.28 05aug2008 | 1 0.01 79.29 16aug2008 | 8 0.08 79.37 01sep2008 | 2 0.02 79.39 12sep2008 | 1 0.01 79.40 18sep2008 | 1 0.01 79.41 01oct2008 | 246 2.46 81.87 01jan2009 | 125 1.25 83.12 01feb2009 | 1 0.01 83.13 01apr2009 | 2 0.02 83.15 01may2009 | 1 0.01 83.16 09jun2009 | 1 0.01 83.17 19jun2009 | 1 0.01 83.18 01jul2009 | 83 0.83 84.01 16jul2009 | 3 0.03 84.04 01aug2009 | 7 0.07 84.11 16aug2009 | 6 0.06 84.17 30aug2009 | 1 0.01 84.18 15sep2009 | 1 0.01 84.19 16sep2009 | 1 0.01 84.20 18sep2009 | 1 0.01 84.21 01oct2009 | 154 1.54 85.75 31dec2009 | 1 0.01 85.76 01jan2010 | 114 1.14 86.90 01feb2010 | 1 0.01 86.91 04feb2010 | 1 0.01 86.92 23mar2010 | 1 0.01 86.93 01apr2010 | 2 0.02 86.95 08apr2010 | 1 0.01 86.96 16apr2010 | 1 0.01 86.97 01may2010 | 1 0.01 86.98 14may2010 | 1 0.01 86.99 15jun2010 | 1 0.01 87.00 16jun2010 | 1 0.01 87.01 01jul2010 | 86 0.86 87.87 15jul2010 | 1 0.01 87.88 25jul2010 | 1 0.01 87.89 01aug2010 | 4 0.04 87.93 16aug2010 | 6 0.06 87.99 19aug2010 | 1 0.01 88.00 01sep2010 | 1 0.01 88.01 01oct2010 | 131 1.31 89.32 04oct2010 | 1 0.01 89.33 02nov2010 | 1 0.01 89.34 29nov2010 | 1 0.01 89.35 07dec2010 | 1 0.01 89.36 09dec2010 | 1 0.01 89.37 17dec2010 | 1 0.01 89.38 01jan2011 | 203 2.03 91.41 16feb2011 | 1 0.01 91.42 01mar2011 | 1 0.01 91.43 03mar2011 | 1 0.01 91.44 08mar2011 | 1 0.01 91.45 11mar2011 | 1 0.01 91.46 16mar2011 | 1 0.01 91.47 18mar2011 | 1 0.01 91.48 28mar2011 | 1 0.01 91.49 01apr2011 | 1 0.01 91.50 22apr2011 | 1 0.01 91.51 16may2011 | 1 0.01 91.52 01jun2011 | 1 0.01 91.53 09jun2011 | 1 0.01 91.54 14jun2011 | 1 0.01 91.55 01jul2011 | 14 0.14 91.69 14jul2011 | 2 0.02 91.71 15jul2011 | 1 0.01 91.72 20jul2011 | 1 0.01 91.73 01aug2011 | 3 0.03 91.76 16aug2011 | 2 0.02 91.78 01sep2011 | 1 0.01 91.79 01oct2011 | 121 1.21 93.00 24oct2011 | 2 0.02 93.02 25oct2011 | 1 0.01 93.03 22nov2011 | 1 0.01 93.04 30nov2011 | 2 0.02 93.06 01jan2012 | 72 0.72 93.78 21feb2012 | 1 0.01 93.79 23feb2012 | 1 0.01 93.80 05mar2012 | 8 0.08 93.88 08mar2012 | 1 0.01 93.89 14mar2012 | 1 0.01 93.90 15mar2012 | 1 0.01 93.91 20mar2012 | 1 0.01 93.92 18apr2012 | 1 0.01 93.93 30apr2012 | 1 0.01 93.94 07may2012 | 1 0.01 93.95 21may2012 | 1 0.01 93.96 01jun2012 | 1 0.01 93.97 06jun2012 | 1 0.01 93.98 01jul2012 | 1 0.01 93.99 01aug2012 | 1 0.01 94.00 01sep2012 | 1 0.01 94.01 01oct2012 | 118 1.18 95.19 15dec2012 | 1 0.01 95.20 01jan2013 | 1 0.01 95.21 13feb2013 | 1 0.01 95.22 01may2013 | 1 0.01 95.23 10may2013 | 1 0.01 95.24 31may2013 | 1 0.01 95.25 15jun2013 | 1 0.01 95.26 30jun2013 | 1 0.01 95.27 01jul2013 | 13 0.13 95.40 17jul2013 | 1 0.01 95.41 15aug2013 | 1 0.01 95.42 15sep2013 | 1 0.01 95.43 01oct2013 | 434 4.34 99.77 01nov2013 | 1 0.01 99.78 06nov2013 | 3 0.03 99.81 20nov2013 | 3 0.03 99.84 04dec2013 | 1 0.01 99.85 15jan2014 | 3 0.03 99.88 05feb2014 | 1 0.01 99.89 19feb2014 | 3 0.03 99.92 05mar2014 | 4 0.04 99.96 19mar2014 | 1 0.01 99.97 01apr2014 | 1 0.01 99.98 01oct2014 | 2 0.02 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 17 Feb 2018