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signature.year (in Demographics)

Variable Summary Undergrad Freshman Sophomore Junior Senior
Sexually active students: Undergrad Freshman Sophomore Junior Senior
Casual-sexually active students: Undergrad Freshman Sophomore Junior Senior

Student signature

The same question also applies to the variables, signature.month, and signature.day.

This variable, signature.year, is used in the construction of the variables, survey.imputed.year, survey.imputed.month, and survey.imputed.day.

students (signature_year)
 All RsFemaleMale
Mean (Std. Dev.) 2007.20 (37.16) 2007.60 (26.10) 2007.44 (27.06)
0 6 0.03% 2 0.02% 1 0.02%
2005 201 1.15% 126 1.06% 61 1.10%
2006 3599 20.51% 2347 19.76% 1211 21.91%
2007 5223 29.76% 3362 28.30% 1818 32.90%
2008 2305 13.13% 1684 14.18% 610 11.04%
2009 3175 18.09% 2289 19.27% 868 15.71%
2010 1230 7.01% 838 7.06% 388 7.02%
2011 1811 10.32% 1230 10.36% 569 10.30%
Missing 6581
(27.27%) 		– 4601
(27.92%) 		– 1935
(25.93%) 		–
Total 24131 100% 16479 100% 7461 100%

0        2005        2006        2007        2008        2009        2010        2011
4124, 2354, 1732, 1610, 209
1642, 1059, 847, 739, 150
0        2005        2006        2007        2008        2009        2010        2011
2852, 1506, 1118, 1048, 131
1218, 682, 545, 472, 95

These graphs reflect only undergraduates attending 4-year colleges who are of normative age -- 18, 19, 20, 21, or 22, +/- 1, for freshman, sophomores, juniors, seniors, and later undergraduates, respectively. Solid lines represent women. Dotted lines represent men.

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