| 摘要 |
PROBLEM TO BE SOLVED: To highly accurately perform component decomposition of time series data without using a keyword.SOLUTION: Each observed value included in time series data is totalized for each predetermined time section (S106), a plurality of clusters are detected by clustering on the basis of contents of each document without using an external reference for a document set with time information and the degree which each document belongs to each cluster is calculated (S102), the degree which each document of the document set with time information belongs to each cluster for each time section is totalized (S104), a regression equation which shows relation between an explanatory variable and an objective variable is estimated by regression analysis while a document totalization result is defined as the explanatory variable and a time series data totalization result is defined as the objective variable (S108), a component ratio of each cluster is calculated for each time section on the basis of an estimation result for each time section obtained by the regression analysis and the document totalization result (S110), and each observed value included in the time series data is decomposed into a component of each cluster (S112). |
