Table 3 Stepwise fitting for the original series.
From: Application of the adaptive sparrow search algorithm in medical supply engineering
Variables | Model ( 1 ) | Model ( 2 ) | Model ( 3 ) |
|---|---|---|---|
Constant | 9.638 (1.381) | 9.766 (1.509) | 3.913 (1.240) |
Trend | −0.296 (−1.054) | −0.304 (−1.144) | \ |
Trend^2 | 0.013 (4.979***) | 0.013 (5.293***) | 0.010 (17.514***) |
ar.L1 | 0.835 (8.184***) | 0.889 (11.370***) | 0.899 (11.362***) |
ar.L2 | 0.089 (0.689) | \ | \ |
ar.L5 | −0.286 (−3.589***) | −0.271 (−3.674***) | −0.259 (−3.468***) |
Sigma2 | 40.087 (6.135***) | 40.440 (6.676***) | 41.119 (6.828***) |
