表8 同群效应的影响机制研究

	Dependent variable:
	Stime	Score	Present	Score	S_major	Score
	(1)	(2)	(3)	(4)	(5)	(6)
GP_Score	0.227***		0.083**		1.121***
	(0.050)		(0.037)		(0.356)
Stime		0.073***
		(0.006)
Present				0.078***
				(0.009)
S_major						0.008***
						(0.001)
Constant	2.094***	2.135***	2.337***	2.130***	-1.810**	2.317***
	(0.118)	(0.018)	(0.088)	(0.023)	(0.840)	(0.006)
控制主体特征变量	YES	YES	YES	YES	YES	YES
控制朋友特征变量	YES	YES	YES	YES	YES	YES
固定效应	YES	YES	YES	YES	YES	YES
Observations	6,160	6,160	6,160	6,160	5,910	5,910
R2	0.042	0.113	0.091	0.106	0.043	0.106
Note:	*p<0.1; **p<0.05; ***p<0.01