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In the fit curve platform the option to have a inverse prediction is not available for quadratic models. It would be nice to add it. Of course if possible to include cubic and others it would be top.
@friedrich thank you for your suggestion. I have a follow up question. With a quadratic or higher order polynomial model, there is a possibility that that the fitted function will not be monotonic, and for a given Y value there could be two possible inverse solutions. How would you propose that situation be handled?
@SamGardner , would it be possible to have both solutions in the output ? Or the user may choose before if he wants the result for the 1st or 2nd solution ?