why is accuracy a metric in data analysis is it possible to check accuracy using rfe when does rfe fail in train what is metric error in rfe what are the warnings using rfe metric error caret is accuracy in metric when rfe is truncated what is the error what is the metric value of caret rfe what is the metric error when using caret's rfe what is the metric k mean in caret what is a warning in caret what is the warning metric in caret? rfe warning metric what is the metric rfe a knn classifier used for what is metric warning rfe metric warning what type of argument is the metric k what size to use for the metric accuracy what is the metric rfe used for