Table 1 Model fitting results

$\mathit{\text{BS}}=f_i+(1-f_i-f_{\mathit{\text{ff}}})p_f^x$

3

0.897

-12931

9.99E-01

46.1395

B S=a+e^bx

2

0.895

-12910

2.86E-05

46.4842

$\mathit{\text{BS}}=f_i+(1-f_i)p_f^x$

2

0.895

-12898

7.53E-08

46.6638

$\mathit{\text{BS}}=\frac{p_f^x+p_s^x}{2}$

2

0.894

-12870

7.86E-14

47.0838

$\mathit{\text{BS}}=\frac{k^n}{k^n+x^n}$

2

0.892

-12785

3.05E-32

48.3971

$\mathit{\text{BS}}=\frac{2}{1+e^{ax}}$

2

0.891

-12765

9.29E-37

48.7567