what is the bias in internal validation can holdout validate bias how is holdout validation biased why is holdout validation biased can holdout be biased why does the holdout method of internal validation contain an error of optimistically corrected bootstrap? can holdout be biased which method is bias biased which method is systematically biased can a model be held based on the assumptions outlined below? how often can internal validation be used why is the bootstrap approach used when using a holdout method, is the variance systematically biased? is holdout validation biased what is the difference between bootstrap and holdout is the holdout method systematically biased why would an internal model be biased? how does resubstitution bias bias occur how can resubstitution errors be biased? how is the resubstitution error biased?