Dynamic deviation

H - Electricity – 04 – M

Patent

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Details

H04M 15/00 (2006.01) G06F 17/18 (2006.01)

Patent

CA 2392567

The present invention relates to a method and apparatus for deriving a statistical measure of variation from a decaying mean, and in particular to their use in telecommunications and anomaly detection applications and a system incorporating the same. A disadvantage of using the conventional statistical averages and measures of variance such as mean and standard deviation is that all input data values have equal influence on the resulting measures. In situations where the event data may be locally stable but vary significantly over longer time scales (e.g. telephone account usage patterns), it is undesirable that older data values relating to prior (pseudo-)stable states should retain equal influence in measures to be applied to the current (pseudo-)stable state. The method comprises a specific mathematical formula for maintaining a sequential deviation measure. The method extends to allow for calculation of deviation to be itself decayed where no events of a given type occur in the event stream.

la présente invention concerne un procédé, et un appareil et un logiciel associés, permettant de détecter des anomalies dans un flux de valeurs de données. Le procédé de l'invention consiste à : recevoir une valeur de données relative au flux de données ; calculer une nouvelle moyenne pondérée sensible à la valeur de données reçue, une moyenne pondérée déjà stockée associée au flux de données, et un taux de décroissance compris entre 0 et 1 ; et calculer une nouvelle mesure de l'écart à partir de la nouvelle moyenne pondérée sensible à la nouvelle moyenne pondérée, à la valeur de données, à une mesure de l'écart déjà stockée associée au flux de données, et au taux de décroissance.

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