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In statistics, aggregate data are data combined from several measurements. When data are aggregated, groups of observations are replaced with summary statistics based on those observations.〔(Aggregation and Restructuring of data ) (chapter 5.6 from the book "R in Action", Manning Publications)〕 In a data warehouse, the use of aggregate data dramatically reduces the time to query large sets of data. Developers pre-summarize queries that are regularly used, such as Weekly Sales across several dimensions such as by item hierarchy or geographical hierarchy. In economics, aggregate data or data aggregates are high-level data that are composed from a multitude or combination of other more individual data, such as: *in macroeconomics, data such as the overall price level or overall inflation rate; and *in microeconomics, data of an entire sector of an economy composed of many firms, or of all households in a city or region. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Aggregate data」の詳細全文を読む スポンサード リンク
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