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Aug
7
awarded  Autobiographer
Apr
30
comment Output of NonlinearModelFit differs from the correct result
Why do you think "[..] the result should be 1.23...*t^0.6548 [..]" in the first place? The results you get for a non-linear fit depend on many factors, for instance the optimization/minimization algorithm used, starting values, convergence criteria etc.
Jan
26
awarded  Supporter