SRGM

Equation

Goel-Okumoto

$\mu \left(t\right)=113.9\left(1-{\text{e}}^{-0.005897t}\right)$

S-shaped

$\mu \left(t\right)=103.43603\left(1-\left(1+0.01591t\right){\text{e}}^{-0.01591t}\right)$

Musa-Okumoto

$\mu \left(\tau \right)=1/0.02788ln\left(\left(0.02788\ast 1.23059t\right)+1\right)$

Song’s model

$\mu \left(t\right)=197.211{\left(1-\frac{9}{9+\ln \left(\frac{197.211+{\text{e}}^{0.2705t}}{1+197.211}\right)}\right)}^{0.2705}$