 of freedom (df) and weighted degree of freedom (wdf) using 5 fitting metrics (CV: Cross-Validation, GCV: Generalised Cross-Validation, AIC: Akaike Information Criterion, BIC: Bayesian Information Criterion, AICc: Akaike Information Criterion Corrected for small sample size) over all eigenSplines generated by get_eigen_spline.
The degree of freedom (df) is obtained by averaging the optimal df across each eigenSpline.
The weighted degree of freedom (wdf) is obtained by weighting the optimal df in each eigenS