Table 2 The results of model fitting and significance test for initial model and revised model.

Model	Goodness of fit		Significance test		C		X		D₁
Model	R₂	R₂*	F	P	t	P	t	P	t	P
Initial	0.995	0.989	165.571	0.000	15.040	0.000	− 8.253	0.000	0.100	0.923
Revised	0.994	0.991	354.951	0.000	18.060	0.000	− 10.31	0.000	–	–

Model	D₂		D₃		(X_t-X₂₀₁₁)D₁		(X_t-X₂₀₁₃)D₂		(X_t-X₂₀₁₇)D₃
Model	t	P	t	P	t	P	t	P	t	P
Initial	− 5.025	0.002	0.44728	0.670	4.514	0.004	− 0.468	0.656	− 2.513	0.046
Revised	− 9.717	0.000	–	–	18.728	0.000	–	–	− 5.222	0.000

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