I have problem to fit data. My data very close to Sin[a*x+b] It should be no problem to find those parameters "a" and "b" but I keep getting this:NonlinearRegress::"bdfit": "Warning: unable to find a fit that is better than \
the mean response."
When I use values for "a" and "b" produced by NonlinearFit and manually adjust them I have better result.
Anybody could help me?
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