Data harmonic analysis method and data analysis device

A data harmonic analysis method, comprising the steps of:

• acquiring a plurality of data pieces to be analyzed;
• calculating similarity between a plurality of data sources which are generation sources of respective data values of the plurality of data pieces acquired in the data acquisition step;
• specifying the number of nodes on an uppermost layer out of one or more layers including parent nodes having no data and respectively arranged on the upside of a lowermost layer as a hierarchy of a plurality of child nodes corresponding to the plurality of data pieces in graph structure representing the plurality of data pieces acquired in the data acquisition step;
• generating a hierarchical graph including the lowermost layer to the uppermost layer on a condition of the number of nodes on the uppermost layer specified in the node number specification step;
• inputting information of a lower limit of similarity for connecting each of the plurality of child nodes on the lowermost layer in the hierarchical graph generated in the hierarchical graph generation step and the parent node on the upper layer by one of the lowermost layer;
• calculating a connection rate between each of the plurality of child nodes and the parent node using the information of the similarity acquired in the similarity calculation step and the information of the lower limit of the similarity input in the similarity lower limit information input step;
• and
• analyzing data by applying harmonic analysis to the data values in the graph according to the connection rate calculated in the connection rate calculation step based upon the hierarchical graph generated in the hierarchical graph generation step.

A data analysis device, comprising:

• a data acquisition unit that acquires a plurality of data pieces to be analyzed;
• a similarity calculation unit that calculates similarity between a plurality of data sources which are generation sources of respective data values of the plurality of data pieces acquired by the data acquisition unit;
• a hierarchical graph generation unit that generates a hierarchical graph having a lower layer as a layer of a plurality of child nodes corresponding to the plurality of data pieces and an upper layer as a layer of parent nodes having no data for graph structure representing the plurality of data pieces acquired by the data acquisition unit;
• a connection rate calculation unit that calculates a connection rate between each of the plurality of child nodes and its parent node in the hierarchical graph generated in the hierarchical graph generation unit using information of the similarity acquired in the similarity calculation unit;
• and
• a harmonic analysis unit that analyzes data by applying harmonic analysis to the data values in the graph based upon the hierarchical graph generated in the hierarchical graph generation unit,
• wherein, in the harmonic analysis unit, the harmonic analysis is carried out according to the connection rate between the child node and the parent node calculated in the connection rate calculation unit.

A data analysis device, comprising:

• a data acquisition unit that acquires a plurality of data pieces to be analyzed;
• a similarity calculation unit that calculates similarity between a plurality of data sources which are generation sources of respective data values of the plurality of data pieces acquired by the data acquisition unit;
• a node number specification unit that specifies the number of nodes on an uppermost layer of one or more layers including parent nodes having no data and arranged on the upside of a lowermost layer as a layer of a plurality of child nodes corresponding the plurality of data pieces in graph structure representing the plurality of data pieces acquired by the data acquisition unit;
• a hierarchical graph generation unit that generates a hierarchical graph including the lowermost layer to the uppermost layer on a condition of the number of nodes specified by the node number specification unit on the uppermost layer;
• a similarity lower limit information input unit that inputs information of a lower limit of the similarity for connecting each of the plurality of child nodes on the lowermost layer and its parent node on the upper layer by one of the lowermost layer in the hierarchical graph generated in the hierarchical graph generation unit;
• a connection rate calculation unit that calculates a connection rate between each of the plurality of child nodes and its parent node using the information of the similarity calculated in the similarity calculation unit and the information of the lower limit of the similarity input from the similarity lower limit information input unit;
• and
• a harmonic analysis unit that analyzes data by applying harmonic analysis to the data values in the graph according to the connection rate calculated in the connection rate calculation unit based upon the hierarchical graph generated in the hierarchical graph generation unit.