Quadratic extrapolation on a dataset
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William Rose on 26 Jul 2022
Yes it is possible. Three points define a quadratic equation. The quadratic equation that passes through (x1,y1), (x2,y2), and (x3,y3) is given by
This is the second order Lagrange polynomial. It is also called the Lagrange interpolating polynomial. You could also use it to extrapolate, if you wish.