Original Dependent Variable (N=4,152)				Alternative 1 (N=4,152)				Alternative 2 (N=3,635)
	Coef.	S.E.	Sig.	Delta-P	Coef.	S.E.	Sig.	Delta-P	Coef.	S.E.	Sig.	Delta-P
Research Participation
Participated in an undergraduate research     program	0.08	0.17			0.08	0.17			0.13	0.18
Background Characteristics and Pre-College Preparation
Race: Native American	0.03	0.21			0.05	0.24			−0.01	0.25
Race: Latino	0.29	0.14	*	6.27%	0.28	0.13	*	6.98%	0.37	0.15	**	8.53%
Race: Black	0.25	0.17			0.36	0.20			0.34	0.20
Race: Asian American/Pacific Islander	0.22	0.15			0.07	0.21			0.28	0.20
Sex: Female	0.04	0.14			0.17	0.14			0.08	0.15
Parental income	0.01	0.02			0.01	0.02			0.01	0.02
Mother’s education	0.06	0.03			0.03	0.03			0.05	0.03
High school GPA	−0.04	0.05			0.03	0.04			−0.01	0.05
Years of high school study in math	−0.18	0.11			−0.16	0.10			−0.19	0.11
Composite SAT scores (100)	0.02	0.05			0.10	0.04	*	2.51%	0.03	0.05
Initial Aspirations and Dispositions
Came to college to prepare for     graduate/professional school	0.25	0.10	**	5.27%	0.29	0.11	**	7.21%	0.33	0.11	**	7.51%
Degree aspiration in 2004: Ph.D.	0.42	0.14	**	9.01%	0.32	0.14	*	7.98%	0.46	0.16	**	10.59%
Degree aspiration in 2004: M.D., D.O., D.D.O.,     D.V.M.	0.19	0.16			0.11	0.14			0.22	0.16
Major in 2004: Life sciences	0.22	0.22			0.29	0.19			0.22	0.23
Major in 2004: Engineering/Computer Science	0.69	0.22	**	14.43%	0.65	0.19	***	16.05%	0.60	0.22	**	13.64%
Major in 2004: Physical sciences	0.71	0.28	**	14.10%	0.73	0.26	**	17.76%	0.80	0.28	**	17.63%
Major in 2004: Health professions (excluding     nursing)	0.41	0.22			0.18	0.19			0.32	0.23
Interactions with Peers and Faculty
Frequency: Interacted with graduate students/TAs	0.05	0.09			0.07	0.08			0.09	0.10
Joined a pre-professional or departmental club	0.04	0.11			0.12	0.09			0.07	0.11
Hours per week spent studying	0.00	0.04			0.01	0.03			0.02	0.04
Faculty mentorship construct	0.23	0.06	***	5.01%	0.17	0.06	**	4.37%	0.24	0.07	***	5.55%
Academic major GPA	0.03	0.04			0.09	0.04	**	2.33%	0.06	0.04
STEM major in 2008	−1.07	0.13	***	−22.47%	−1.18	0.10	***	−28.59%	−1.15	0.12	***	−25.71%
Senior Year Dispositions
Career focus: Working for social change	0.37	0.07	***	7.70%	0.23	0.05	***	5.75%	0.34	0.06	***	7.66%
Career focus: Discovery/enhancement of     knowledge	−0.03	0.07			0.14	0.06			0.08	0.07
End-Of-College Finances
Total loans taken out for undergraduate education     ($1,000)	−0.01	0.00	**	−0.17%	−0.01	0.00	*	−0.13%	−0.01	0.00	*	−0.15%
Financial aid: Own resources	−0.05	0.03			0.02	0.03			−0.02	0.04
Financial aid: Aid that does not need to be repaid	0.03	0.03			0.03	0.03			0.03	0.03
Financial aid: Aid that must be repaid	0.02	0.03			0.06	0.03			0.04	0.03
Institutional Characteristics
Intercept	0.84	0.64			−0.21	0.58			0.05	0.72
Control: Private	0.08	0.21			0.32	0.18			0.32	0.23
HBCU	0.28	0.41			0.30	0.35			0.38	0.46
Selectivity (100)	0.14	0.08			0.10	0.07			0.17	0.08	*	3.93%
Percent White (10)	0.00	0.03			0.04	0.04			−0.01	0.04
Percent STEM (10)	−0.05	0.05			−0.02	0.05			−0.07	0.06
Undergraduate full-time equivalent (log)	0.10	0.11			0.01	0.10			0.11	0.12
Research Participation
Participated in an undergraduate research     program	0.44	0.17	**	9.04%	0.49	0.15	**	11.94%	0.51	0.18	**	11.02%
Background Characteristics and Pre-College Preparation
Race: Native American	0.09	0.25			0.08	0.22			−0.04	0.25
Race: Latino	0.34	0.16	*	7.20%	0.35	0.15	*	8.58%	0.35	0.17	*	7.70%
Race: Black	0.44	0.18	*	9.12%	0.57	0.17	***	13.68%	0.54	0.20	**	11.47%
Race: Asian American/Pacific Islander	0.44	0.17	*	8.98%	0.17	0.15			0.42	0.18	*	9.02%
Sex: Female	−0.13	0.14			0.06	0.12			−0.05	0.14
Parental income	−0.05	0.03			−0.04	0.02			−0.06	0.03	*	−1.33%
Mother’s education	0.08	0.04	*	1.63%	0.06	0.03	*	1.58%	0.08	0.04	*	1.71%
High school GPA	−0.02	0.05			0.06	0.04			0.02	0.05
Years of high school study in math	−0.15	0.12			−0.13	0.10			−0.16	0.12
Composite SAT scores (100)	0.02	0.05			0.15	0.05	**	3.71%	0.09	0.05
Initial Aspirations and Dispositions
Came to college to prepare for     graduate/professional school	0.47	0.11	***	9.21%	0.38	0.11	***	9.14%	0.46	0.12	***	9.63%
Degree aspiration in 2004: Ph.D.	0.59	0.14	***	12.05%	0.50	0.12	***	12.22%	0.65	0.14	***	13.95%
Degree aspiration in 2004: M.D., D.O.,     D.D.O., D.V.M.	0.68	0.15	***	13.90%	0.56	0.13	***	13.74%	0.72	0.15	***	15.52%
Major in 2004: Life sciences	−0.24	0.22			−0.02	0.18			−0.07	0.21
Major in 2004: Engineering/Comp. Science	−0.87	0.24	***	−20.00%	−0.68	0.20	***	−16.84%	−0.75	0.24	**	−17.70%
Major in 2004: Physical sciences	−0.28	0.25			−0.15	0.22			−0.11	0.24
Major in 2004: Health professions     (excluding nursing)	0.19	0.22			0.13	0.18			0.29	0.21
Interactions with Peers and Faculty
Frequency: Interacted with graduate     students/TAs	0.24	0.10	*	5.00%	0.26	0.09	**	6.41%	0.29	0.10	**	6.34%
Joined a pre-professional or departmental club	0.15	0.11			0.32	0.11	**	7.93%	0.26	0.12	*	6.04%
Hours per week spent studying	0.10	0.04	**	2.15%	0.09	0.03	**	2.17%	0.10	0.04	**	2.30%
Faculty mentorship construct	0.18	0.07	**	3.71%	0.16	0.06			0.21	0.07	**	4.69%
Academic major GPA	0.17	0.04	***	3.63%	0.22	0.04	***	5.31%	0.21	0.04	***	4.52%
STEM major in 2008	2.23	0.14	***	48.51%	2.06	0.12	***	47.28%	2.18	0.14	***	48.53%
Senior Year Dispositions
Career focus: Working for social change	0.14	0.08			−0.01	0.07			0.11	0.08
Career focus: Discovery/enhancement of     knowledge	0.27	0.07	***	5.66%	0.35	0.06	***	8.41%	0.33	0.07	***	6.98%
End-Of-College Finances
Total loans taken out for undergraduate     education ($1,000)	0.00	0.00			0.00	0.00			0.00	0.00
Financial aid: Own resources	−0.02	0.04			0.04	0.03			0.00	0.04
Financial aid: Aid that does not need to be repaid	0.04	0.03			0.05	0.03			0.05	0.03
Financial aid: Aid that must be repaid	−0.03	0.03			0.01	0.03			−0.02	0.04
Institutional Characteristics
Intercept	−4.11	0.76			−4.63	0.66			−4.51	0.80
Control: Private	0.06	0.21			0.03	0.18			0.07	0.21
HBCU	0.00	0.48			−0.12	0.42			−0.09	0.51
Selectivity (100)	0.20	0.08	**	4.26%	0.14	0.07	*	3.37%	0.19	0.08	**	4.27%
Percent White (10)	−0.04	0.04			−0.02	0.04			−0.08	0.04	*	−1.75%
Percent STEM (10)	−0.04	0.04			−0.01	0.04			−0.05	0.04
Undergraduate full-time equivalent (log)	0.13	0.11			−0.04	0.10			0.11	0.11