Noise detection and elimination in data preprocessing: Experiments in medical domains

Compression measures used in inductive learners, such as measures based on the minimum description length principle, can be used as a basis for grading candidate hypotheses. Compression ± based induction is suited also for handling noisy data. This paper shows that a simple compression measure can be used to detect noisy training examples, where noise is due to randomclassication errors. A technique is proposed in which noisy examples are detected and eliminated from the training set, and a hypothesis is then built from the set of remaining examples. This noise elimination method was applied to preprocess data for four machine ± learning algorithms, and evaluated on selected medical domains.