Detecting Anomalies in Production Quality Data Using a Method Based on the Chi-Square Test Statistic.

This paper describes the capability of the Chi-Square test statistic at detecting outliers in production-quality data. The goal is automated detection and evaluation of statistical anomalies for a large number of time series in the production-quality context. The investigated time series are the temporal course of sensor failure rates in relation to particular aspects (e.g. type of failure, information about products, the production process, or measuring sites). By means of an industrial use case, we show why in this setting our chosen approach is superior to standard methods for statistical outlier detection.