研究生: |
謝功進 TA - CONG TIEN |
---|---|
論文名稱: |
組合資料的預測分析研究 A study of forecasting analysis in compositional data |
指導教授: |
王福琨
Fu-Kwun Wang |
口試委員: |
歐陽超
Chao Ou-Yang 羅士哲 Shih-Che Lo |
學位類別: |
碩士 Master |
系所名稱: |
管理學院 - 工業管理系 Department of Industrial Management |
論文出版年: | 2012 |
畢業學年度: | 100 |
語文別: | 英文 |
論文頁數: | 65 |
中文關鍵詞: | 組合資料 、對數比值分析轉換法 、多變量預測 |
外文關鍵詞: | Compositional data, Log-ratio analysis transformation, Multivariate forecasting |
相關次數: | 點閱:195 下載:0 |
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組合時間序列資料是隨著時間變化之比例向量所組成,在許多學術研究上被使用,例如地質學等。特別是以統計方法應用於預測之領域。然而,基於每一向量元素之總和必須等於一之研究設計限制,因此組合時間序列資料已被證明很難利用統計方法解決問題。在本研究中,對數比值分析轉換法可以有效的解決多變量常態分配的組合型資料固有的問題,此新方法主要是在 simplex space 與 real space 之間轉換,以三家知名電腦公司的操作費用資料將此方法與傳統三種多變量預測模型做比較,以驗證所提出的預測模型。結果顯示本研究出所提出之預測方法有較佳的結果。
Compositional time series data, which consists of vectors of proportions changing over time, usually occurs in many disciplines, such as geosciences, financial analysis etc. and give rise to some interesting statistical considerations, especially forecasting issue. However, it has proved to be difficult to handle statistically stem from the awkward constraint that the components of each vector must sum to unity. In this research, the log-ratio analysis transformation algorithm could be effectively used in conjunction with the notation of multi-logistic normal distribution to deal with this inherent awkwardness of compositional time series data. Furthermore, a new forecasting approach based on the core idea of transforming and retransforming all raw compositional time series between the simplex space and real space will be proposed. And then, the proposed approach will compare with three conventional multivariate forecasting models. Three compositional operation expense series from well-known computer manufacturing companies are used to demonstrate the forecasting performance in terms of the Aitchison distance value. The results showed that our approach outperforms other models.
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