Regression Data Analysis, Overfitting, Loocv, Crossvalidation, Calibration.
basis is zero (orthogonal): We can also look up orthogonality in physics and mathematics textbooks for Legendre (P_i) and Chebyshev (T_i) polynomials: where δ_ij​ is the Kronecker delta, equal to 1 if i = j and 0 otherwise. Methods to avoid overfitting It is well known that higher order fits can