Table 2.

Some of the functions describing in vitro drug dissolution.

Description	Function
Exponential	F1(θ1, t) = 1 − e(−θ11t)
Weibull	F1(θ1, t) = 1 − e(−θ11tθ12)
Logistic	$F_1({\theta }_1,t)=\frac{e^{({\theta }_{11}+{\theta }_{12}\text{log}\left(t\right))}}{1+e^{({\theta }_{11}+{\theta }_{12}\text{log}\left(t\right))}}$
Hill	$F_1({\theta }_1,t)=\frac{t^{{\theta }_{11}}}{{\theta }_{12}+t^{{\theta }_{11}}}$

θ_1i, (i = 1 and 2): parameter θ₁ at observation times t₁ and t₂.