Empirical Analysis of Supplier Inefficient Investment at Customer Risks Based on Supply Chain Data

Table 7

Difference test of grouped samples.

Regression model	UnderInvestt + 1
	(1)	(2)	(3)	(4)
khRiskt	0.068	0.089	0.061	0.049
	(1.87)	(1.52)	(2.71)	(0.94)
Sizet	−0.024	−0.020	−0.018	−0.028
	(−3.92)	(−7.25)	(−4.80)	(−6.54)
Levt	0.033	0.013	−0.012	0.024
	(1.00)	(0.68)	(−0.59)	(1.13)
Casht	0.114	0.032	0.072	0.038
	(3.15)	(1.73)	(2.43)	(1.57)
Aget	0.008	≤0.001	0.017	0.008
	(0.82)	(−0.04)	(1.40)	(0.90)
Ocft	−0.08	−0.02	0.004	−0.065
	(−1.48)	(−0.64)	(0.14)	(−1.94)
Tact	−0.008	−0.006	−0.008	−0.002
	(−0.41)	(−1.31)	(−1.53)	(−0.24)
Sharet	−0.123	−0.037	0.086	−0.194
	(−0.77)	(−0.30)	(0.72)	(−1.59)
ROAt	0.101	−0.002	0.099	0.041
	(1.52)	(−0.05)	(2.27)	(0.86)
khSizet	−0.002	≤0.001	0.001	−0.002
	(−0.89)	(−0.06)	(1.18)	(−0.90)
khLevt	0.044	0.027	−0.001	0.027
	(1.03)	(1.19)	(−0.03)	(1.06)
khAget	0.003	0.002	0.002	0.007
	(0.29)	(0.52)	(0.30)	(1.16)
khOcft	−0.01	−0.032	0.041	−0.019
	(−0.15)	(−0.76)	(1.27)	(−0.46)
Cons	0.443	0.425	0.320	0.620
	(3.52)	(7.35)	(3.56)	(5.47)
Year	Control	Control	Control	Control
Industry	Control	Control	Control	Control
N	164	168	157	173
R-squared	0.4102	0.4843	0.4818	0.5180

Symbols , , and represent significance levels of 1%, 5%, and 10%, respectively.