Actual Cost

exponential model

delayed S-shaped model

infection S-shaped model

parameter

$\alpha$

1.325 × 10⁶

1.317 × 10⁶

2.728 × 10⁶

$\beta$

9.286 × 10⁻³

2.387 × 10⁻²

1.253 × 10⁻²

c

-

-

3.283 × 10¹

$\sigma$

4.840 × 10⁻³

2.762 × 10⁻³

1.011 × 10⁻³

AIC

1229.007

1163.817

1205.231