iterchoiceAcv searches the interval from mini to
maxi for a minimum of the function criterion with respect
to its first argument using optimize. This function is not intended to be used directly.iterchoiceAcv(X, y, bx, df, kernelx, ddlmini, ntest, ntrain, Kfold,
type, npermut, seed, Kmin, Kmax, criterion, fraction)Kmin and Kmax).ibr