Other widely used words are outliers, exceptions, surprises, and aberrations. The need for action on the relevance of the issue finds outliers.
Reference List
- Emmott, A. F., Das, S., Dietterich, T., Fern, A., Wong, W. K. (2013, August). Systematic construction of anomaly detection benchmarks from real data. In Proceedings of the ACM SIGKDD workshop on outlier detection and description (pp. 16-21).