Calibrating a simple time varying model

Hello friends,

I am a master student in economics and I want to calibrate this simple general equation model.

An equation:

I(t)=w*L(t) + [A(t)*H(t)-T(t)-E(t)]

where, t is the time period=[year 1950-2010] I = GDP in dollars w= salary of low skilled employees in dollars L: number of Low skilled employees A: productivity in interval=[0,1] H: salary of high skilled employees T: transportation cost in dollars E: education cost in dollars

Thank you very much in advance.

Regards, Sumit