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The error of an estimate or prediction is its deviation from the true value, which may be unobservable (e.g., regression parameters), or observable (e.g., future realizations). Use the [error-message] tag to ask about software errors.
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Polynom fit with big errors and wrong parameters
When I generate code for a polynomial function 3rd order with a not constant offset/error in the $y$-axis and then try to fit a polynom at it with scipy.optimize not only the errors are very big, but also …