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I’ve done an experiment where I swung a pendulum under air resistance. Is it possible to model the data using the following differential equation and find a b-value? (y”[x])+ Sin[y[x]] + b(y'[x]) == 0, y[0] == 1.5, y'[0] == 0}, y, {x, 0, 3*Pi}]Read more

I have an experimental data (blue) and three possible models from simulation. I want to find the best ratio of those three models to fit experimental data. I tried FindMinimum and pearsonTest, but it only worked if i have two models pearsonTest[obs_List, exp_List] /; Length[obs] == Length[exp] := Block[{t}, t = Total[(obs – exp)^2/exp] //Read more