(1)	(2)	(3)
Intercept	0.400***	0.364***	0.367***
	(0.062)	(0.051)	(0.049)
x1	1.102***	1.071***	1.098***
	(0.065)	(0.054)	(0.052)
x2		-0.687***	-0.677***
		(0.050)	(0.049)
x3			0.281***
			(0.050)
N	400	400	400
R²	0.419	0.604	0.633
Adj. R²	0.418	0.602	0.631
F	287.119	302.955	227.960
Standard errors in parentheses
*** p<0.01, ** p<0.05, * p<0.10