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| Title: | 基於 multi-resolution B-spline basis 之二維曲面估計
Estimate of the two-dimensions surface based on multi-resolution B-spline basis |
| Authors: | 林哲宇
Lin, Zhe-Yu |
| Contributors: | 黃子銘
林哲宇
Lin, Zhe-Yu |
| Keywords: | B-spline迴歸
節點選取
曲面估計
B-spline regression
Knot selection
Surface estimation |
| Date: | 2020 |
| Issue Date: | 2020-05-05 11:56:46 (UTC+8) |
| Abstract: | 本研究是根據Yuan[12]提出的Multi-resolution B-spline basis節點放置方法對於節點的篩選做進一步的改良，以擾動項ε的變異數σ^2為標準，採用向後刪除的概念提出方法一及方法二，也將其改良後的方法透過張量積擴展到二維曲面的估計，以copula密度函數作為迴歸函數，與核迴歸中的局部線性迴歸的結果進行比較。 依模擬結果，方法一會因為σ的估計膨脹而篩選掉過多節點，方法二受σ的估計影響較小，估計效果較佳，也較為穩定。 在以copula密度函數作為迴歸函數的模擬實驗中，較不平滑的迴歸函數使用方法二來估計，估計效果較佳；較平滑的迴歸函數使用局部線性迴歸來估計為最佳，但如果在σ的估計上能更好，方法二的估計效果可能優於局部線性迴歸。
This thesis is based on the multi-resolution B-spline basis knots placement method proposed by Yuan[12] to further improve the selection of knots. Based on the variation of the disturbance term, Method 1 and Method 2,are proposed using the concept of backward deletion. The improved method is also extended to the estimation of the two-dimensional surface. through the tensor product. Simulation studies have been carried out to compare the performance of Methods 1 and 2, and local linear regression. According to the results of simulation studies, Method 1 tends to filter out too many knots because of the large estimation error of σ,and Method 2 is less affected by the estimation of σ. The estimation based on Method 2 is more accurate and stable. In the studies where Methods 1 and 2, and local linear regression are compared, Method 2 outperforms local linear regression when the regression function is less smooth. When the regression function is smooth, local linear regression performs better than Method 2. However,if the estimation of σ can be better, the estimation accuracy of Method 2 may be better than local linear regression. |
| Reference: | [1] William S. Cleveland and Susan J. Devlin. Locally weighted regression: An approach to regression analysis by local fitting. Journal of the American Statistical Association, 83(403):596–610, 1988.
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[9] Abe Sklar. Fonctions de r´epartition "a n dimensions et leurs marges. Publications de l’Institut de Statistique de l’Universit´e de Paris, 8:229–231, 1959.
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[11] Wannes Van Loock, Goele Pipeleers, J. Schutter, and Jan Swevers. A convex optimization approach to curve fitting with b-splines. IFAC Proceedings Volumes (IFAC-PapersOnline), 18:2290–2295, 2011.
[12] Yuan Yuan, Nan Chen, and Shiyu Zhou. Adaptive b-spline knot selection using multi-resolution basis set. IIE Transactions, 45:1263–1277, 2013.
[13] Shanggang Zhou and Xiaotong Shen. Spatially adaptive regression splines and accurate knot selection schemes. Journal of the American Statistical Association, 96(453):247–259, 2001 |
| Description: | 碩士
國立政治大學
統計學系
106354016 |
| Source URI: | http://thesis.lib.nccu.edu.tw/record/#G0106354016 |
| Data Type: | thesis |
| DOI: | 10.6814/NCCU202000415 |
| Appears in Collections: | [統計學系] 學位論文
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| 401601.pdf | | 2247Kb | Adobe PDF2 | 61 | View/Open |
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