Forecasting of Chinese E-Commerce Sales: An Empirical Comparison of ARIMA, Nonlinear Autoregressive Neural Network, and a Combined ARIMA-NARNN Model

Table 1

ADF test of first-order differential sequence.

Null Hypothesis: D(DLOGDATA) has a unit root
Exogenous: Constant
Lag Length: 5 (Automatic - based on SIC, maxlag=13)
			t-Statistic	Prob.
Augmented Dickey-Fuller test statistic			-10.36760	0.0000
Test critical values:	1% level		-3.479656
	5% level		-2.883073
	10% level		-2.578331