**Curve fitting - Wikipedia**
https://en.wikipedia.org/wiki/Curve_fitting

Curve fitting is the process of constructing a curve, or mathematical function, that has the best fit to a series of data points, possibly subject to constraints. Curve fitting can involve either interpolation, where an exact fit to the data is required, or smoothing, in which a "smooth" function is constructed that approximately fits the data. A related topic is regression analysis, which focuses more on questions of statistical inferencesuch as how much uncertainty is present in a curve tha…

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