$V_{oc} = A_0 + A_1z + \frac{A_2}{z} + A_3ln(z) + A_4ln(1-z)$
I have the above non-linear equation to describe my model. $V_{oc}$ is measurable so I know its value. I know how $z$ is propagated with time. I am trying to find $A_i$, for $i=0,1,2,3,4$ so that I can estimate $z$ values for corresponding $V_{oc}$ in real time. Is there any way to find constant $A_i$ values?