SRGM

Equation

Goel-Okumoto

$\mu \left(t\right)=0.0205675\left[1-{\text{e}}^{0.0001734t}\right]$

S-shaped

$\mu \left(t\right)=8016\left(1-\left(1+0.0002404t\right){\text{e}}^{-0.0002404t}\right)$

Musa-Okumoto

$\mu \left(\tau \right)=1/-0.026714ln\left(\left(0.05578\ast -0.026714t\right)+1\right)$

Song’s model

$\mu \left(t\right)=1926{\left(1-\frac{9}{9+\ln \left(\frac{1926+{\text{e}}^{0.03675t}}{1+1926}\right)}\right)}^{0.03675}$