Classifier Monitoring using Statistical Tests Rafal Latkowski(1,2) and Cezary Glowinski(1) (1) SAS Institute ul. Gdanska 27/31, 01-633 Warszawa, Poland Cezary.Glowinski@spl.sas.com (2) Warsaw University Institute of Computer Science, ul. Banacha 2, 02-097 Warszawa, Poland, R.Latkowski@mimuw.edu.pl Abstract This paper is addressed to methods for early detection of classifier fall-down phenomenon, what gives a possibility to react in advance and avoid making incorrect decisions. For many applications it is very essentials that decisions made by machine learning algorithms were as accurate as it is possible. The proposed approach consists in applying a monitoring mechanism only for result of classification, what not cause an additional computational overhead. The empirical evaluation of monitoring method is presented based on data extracted from simulated robotic soccer as an example of autonomous agent domain and synthetic data that stand for standard industrial application.