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Thanks for the response Jim! I did remove the underscore, thanks for pointing out. It is true that I have this convergence problem but usually Mathematica gives some result anyway. Now it just does not give any output at all. I also tried NSolve...
I found the problem is not with the root finder, it lies in the theory. Once the model is corrected, I get the solution.
Hi Rohit! Thanks for your response. I am not sure a NonlinearModelFit will work. What I am doing is something like method of moments. But I will try it. Thanks again.