Statistical criteria for the ranking of xc functional approximations based on bias–variance tradeoff using the ASCDB database: Akaike information criterion (AIC), Vapnik–Chervonenkis criterion (VCC), and cross-validation criterion (CVC). The ranking of each functional among the 60 considered is reported in parenthesis next to each result. In addition, the degrees of freedom (DoF) estimated from the number of parameters, and the weighted mean unsigned error for ASCDB are also reported. Results are sorted according to the average ranking among the three criteria. A full reference for each functional is also provided in the last column.