Table 4.

Maximum Likelihood Estimates of Multivariate Cox Regression Model for Naturalization: Immigrants Admitted in 1978-1987

Class of Admission	Family Sponsored	Estimate	Hazard Ratio
	1^st Principal: Unmarried S/D of Citizen	-0.03 ***	0.97
	2^nd Principal: Spouse of LPR	0.23 ***	1.26
	2^nd Principal: Child of LPR	-0.08 ***	0.92
	4^th Principal: Married S/D of Citizen	-0.11 ***	0.90
	4^th Derivative: Spouse of Married S/D of Citizen	0.01 ***	1.01
	5^th Principal: Sibling of Citizen	-0.06 ***	0.94
	5^th Derivative: Spouse of Sibling of Citizen	0.12 ***	1.13
	Employment Sponsored
	3rdPrincipal: Professional	0.35 ***	1.42
	3rdDerivative: Spouse of Professional	0.20 ***	1.22
	6^th Principal: Skilled or Special	0.37 ***	1.45
	6^th Derivative: Spouse of Skilled or Special	0.21 ***	1.23
	Exempt Immediate Relatives
	Principal: Spouse	0.27 ***	1.31
	Principal: Parent	-0.27 ***	0.76
	Refugees, Asylees, and Others	Reference	1.00
Age Groups	21 To 29	2.09 ***	8.08
	30 To 39	1.89 ***	6.62
	40 To 49	1.66 ***	5.26
	50 To 59	1.49 ***	4.44
	60 To 69	1.02 ***	2.77
	70 and above	Reference	1.00
	Male	0.00	1.00
	Prior Nonimmigrant Experience (Yes)	0.25 ***	1.28
	Married	-0.01	0.99
Fiscal Year Cohort	1978	-0.21 ***	0.81
	1979	-0.17 ***	0.84
	1980	-0.12 ***	0.89
	1981	-0.11 ***	0.90
	1982	-0.09 ***	0.91
	1983	-0.10 ***	0.90
	1984	-0.07 ***	0.93
	1985	-0.04 ***	0.96
	1986	-0.02 ***	0.98
	1987	Reference	1.00
Country of Origin	China	1.78 ***	5.93
	India	1.28 ***	3.60
	Korea	1.14 ***	3.13
	Philippines	2.04 ***	7.69
	Vietnam	1.80 ***	6.05
	Jamaica	0.96 ***	2.61
	Cuba	1.28 ***	3.60
	Dominican Republic	0.38 ***	1.46
	Colombia	1.12 ***	3.06
	Mexico	Reference	1.00
Model Summary
	-2 Log Likelihood	20,463,308
	Model Chi-Square (df)	424,174 (39)
	Number of Observation	1,827,893