Thanks for your response. I need to answer your question one after ther other
(1) For each year the GDP amount in Naira (Name of the currency) is specified. For instance, for the year 2022, the GDP generated is over 3 million naira (year 2022 = 3, 023, 744. 14 naira). This goes for the remaining year too.
(2) The data represents the gross domestic (in millions) generated from education in a country from year 2015 - 2022
(3) I intend to solve the ode, where diff(G[dp](T), T) is a compartmental variable and psi[i](i=1-3) and delta denotes the different contribution rates and loss of G[dp] respectively
(4) the parameters are the inital parameters, but i intend to generate another set of parameter values through some minimization methods and F[d], L[d] and E[c] are functions of time