Regression Data Analysis, Overfitting, Loocv, Crossvalidation, Calibration.
over an interval. Trigonometric Basis Functions like sine and cosine can form a basis function set. For example, Fourier basis functions are sinusoidal functions of the form ϕ_i​(x) = sin(ωi​x) or cos(ωi​x), where ωi​ determines the frequency. These basis functions are particularly useful for