ABNORMALITY DETECTION APPARATUS, ABNORMALITY DETECTION METHOD, AND COMPUTER PROGRAM

To improve accuracy in detection of abnormality of newly acquired data by using a variable data group excluding pretended correlation between the variable data groups if there exists a variable data group having a unit root.SOLUTION: An abnormality detection apparatus according to the present invent...

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Hauptverfasser: NORITAKE SHIGETOSHI, YUNOKI TAKAHIRO, YOGO YASUHIRO, WADA KENSUKE, MIYAZAKI IZURU, IWATA TAKAMICHI
Format: Patent
Sprache:eng ; jpn
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Zusammenfassung:To improve accuracy in detection of abnormality of newly acquired data by using a variable data group excluding pretended correlation between the variable data groups if there exists a variable data group having a unit root.SOLUTION: An abnormality detection apparatus according to the present invention has a data acquiring unit for acquiring a data set including a variable data group for a plurality of variables which is a variable data group that is a group of a plurality of data for a predetermined variable, a data processing unit for calculating a correlation coefficient for a plurality of variable data groups, and a determining unit for determining abnormality of data depending on a newly acquired variable using the correlation coefficient. The data processing unit, when there is a unit root in at least one of the plurality of variable data groups, carries out preprocessing for the variable data group having a unit root before calculation of the correlation coefficient.SELECTED DRAWING: Figure 1 【課題】単位根が存在する変数データ群が存在する場合に、変数データ群間の見せかけの相関を排除した変数データ群を用いて、新たに取得されるデータの異常検出の精度を向上させる。【解決手段】異常検出装置は、所定の変数についての複数のデータの集合である変数データ群であって、複数の変数についての変数データ群を含むデータセットを取得するデータ取得部と、複数の変数データ群間における相関係数を算出するデータ処理部と、相関係数を用いて、新たに取得された変数に依存するデータの異常判定を行う判定部と、を備え、データ処理部は、複数の変数データ群の内の少なくとも1つに単位根が存在する場合に、相関係数の算出に先立ち、少なくとも単位根が存在する変数データ群に対して前処理を行う。【選択図】図1