$S\left(\tau \right)$

$\theta$ in Equation (3) (Months)

$\theta$ M. model $\alpha =9.4924$

error %

$\theta$ M.model $\alpha =10$

error%

0.9858

2.7498

5.4786

97.68

5.7786

108.28

0.98

5.5562

6.8226

22.67

7.1600

29.26

0.97

8.4184

9.0845

8.07

9.5000

13.78

0.96

11.0682

11.3786

2.79

11.8200

8.26

0.95

13.6517

13.6562

0.03

14.3800

5.38

0.94

16.2345

15.9351

1.78

16.7400

3.39

0.93

18.8326

18.2180

3.19

19.1800

1.79

0.92

21.4452

20.4982

4.37

21.5800

0.58

0.91

24.1018

22.7578

5.38

23.8700

0.37

Expected value

16.21

19.01