ifelse cross validation ridge regression trx cross validation which data set is used for cross validation r ridge regression definition what is k-fold what is k fold cross validation i r what is the k fold of the regression what type of cross validation is used for ridge regression why use a ridge regression in r why use ridge regression what is r for ridge regression what type of value does r use in cross validation what type of data to cross validate ridge regression in r cross validation k-fold k-fold and ridge regression what is the measure of the ridge in r which regression is used to test k-fold or hold-out how to use r for cross validation what is k fold cross validation in r what are the r values of ridge and normal regression