政大機構典藏-National Chengchi University Institutional Repository(NCCUR):Item 140.119/94725

政大機構典藏-National Chengchi University Institutional Repository(NCCUR):Item 140.119/94725

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题名:	貝氏曲線同步化與分類 Bayesian Curve Registration and Classification
作者:	李柏宏 Lee, Po- Hung
贡献者:	黃子銘 Huang, Tzee-Ming 李柏宏 Lee,Po- Hung
关键词:	函數型資料分析曲線同步化曲線區別分析馬可夫鏈蒙地卡羅法 function data analysis curve registration curve discrimination Markov chain Monte Carlo method
日期:	2009
上传时间:	2016-05-09 11:40:08 (UTC+8)
摘要:	函數型資料分析為近年發展的統計方法。函數型資料是在一段特定時間上，我們只在離散的時間點上收集觀測值。例如:氣象觀測站所收集到的每月氣溫、雨量資料，即是一種常見的函數型資料。函數型資料主要有三種特色，共同趨勢性、觀測個體反應強度不同，觀測個體時間特色上的差異。本文研究主要是使用，Brumback與Lindstrom在2004所提出的自模型迴歸族(self-modeling)當作模型架構來處理函數型資料的趨勢性與個體反應強度。而為了處理函數型資料的時間差異性，我們在模型中加入時間轉換函數(time transformation function)，處理函數型資料的時間差異性步驟，這個過程稱為同步化。經過同步化的處理後，能幫助研究者更清楚資料的特性。模型中除了時間轉換函數的部份，其餘模型中的參數我們是利用馬可夫鏈蒙地卡羅法中的Gibbs Sampling來進行參數的抽樣，並以取出的抽樣值來估計參數。時間轉換函數的部份，我們使用概似懲罰函數(penalized likelihood function)來估計時間轉換函數的參數部份。由於函數型資料擁有趨勢性，我們預期不同類別的資料，會呈現不同的趨勢性，我們將利用此一特色當做分類上的標準。關鍵詞:函數型資料分析、曲線同步化、曲線區別分析、馬可夫鏈蒙地卡羅法。 Functional data are random curves observed in a period of time at discrete time points.They often exhibit a common shape, but with variations in amplitude and phase across curves.To estimate the common shape,some adjustment for synchronization is often made,which is also known as time warping or curve registration.In this thesis,splines are used to model the warping functions and the common shape. Certain parameters are allowed to be random.For the estimation of the random parameters,priors are proposed so that samples from the posteriors can be obtained using Markov chain Monte Carlo methods.For the estimation of non-random parameters, a penalized likelihood approach is used. It is found via simulation studies that for a set of random curves with a common shape,the estimated common shape function looks like the true function up to a location-scale transform,and the curve alignment based on estimated time warping functions looks reasonable.For two groups of random curves which differ in the group common shape functions,synchronization also improves the discrimination between groups in some cases. Key words: functional data analysis,curve registration,curve discrimination,markov chain monte carlo method.
參考文獻:	[1] Anderson, C. W.,Stolz, E. A.,and Shamsunder, S., Multivariate autoregressive models for classication of spontaneous electroencephalogram during mental tasks. IEEE Transactions on Biomedical Engineering, 45:277{286, 1998. [2] Brumback, L. C.,Lindstrom, M. J., Self modeling with exible, random time transformations. Biometrics, 60(2):461{470, 2004. [3] Buner, F.,Biau, G.,and Wegkamp, M. H., Functional classication in hilbert spaces. IEEE Transactions on Information Theory, 51:2163{2172, 2005. [4] Deboor, C., A Practical Guide to Splines. Springer-Verlag Berlin and Heidelberg GmbH & Co. K, 1978. [5] Carroll, R. J.,Ruppert, D., Spatially-adaptive penalties for spline tting. Australian and New Zealand Journal of Statistics, 42:205{223, 2000. [6] Conan-Guez, B.,Rossi, F., Phoneme discrimination with functional multilayer perceptron. In D. Banks, L. House, F. R. McMorris, P. Arabie, and W. Gaul, editors, Classication, Clustering, and Data Mining Applications (Proceedings of IFCS 2004), pages 157{165, Chicago, Illinois, July 2004. IFCS, Springer. [7] Fleet, S. L.,Glendinning, R. H., Classifying non-uniformly sampled vector-valued curves. Pattern Recognition, 37:1999{2008, 2004. [8] Gareth, M. J., Curve alignment by moment. Annals of Applied Statistics, 1:480{501, 2007. [9] Gasser, T.,Kneip, A., Searching for structure in curve samples. Journal of the American Statistical Association, 90:1179{1188, 1995. [10] Gelman, A.,Rubin, D. B., Inference from iterative simulation using multiple sequences. Statistical Science, 7:457{511, 1992. [11] Geweke, J., Evaluating the accuracy of sampling-based approaches to the calculation of posterior moments (Disc: P189-193). In J. M. Bernardo, J. O. Berger, A. P. Dawid, and Smith, editors, Bayesian Statistics 4. Proceedings of the Fourth Valencia International Meeting, pages 169{188. Clarendon Press [Oxford University Press], 1992. [12] Heidelberger, P.,Welch, P. D., Simulation run length control in the presence of an initial transient. Operations Research (INFORMS), 31:1109{1144, 1983. [13] James, G. M.,Hastie, T. J., Functional linear discriminant analysis for irregularly sampled curves. Journal of the Royal Statistical Society Series B, 63:533{550, 2001. [14] Jank, W.,Shmueli, G., Functional data analysis in electronic commerce research. Statistical Science, 21(2):155{166, 2006. [15] Kneip, A.,Gasser, T., Convergence and consistency results for self-modeling nonlinear regression. The Annals of Statistics, 16:82{112, 1988. [16] Lang, S.,Brezger, A., Bayesian p-splines. Journal of Computational and Graphical Statistics, 13:183{212, 2004. [17] Naya, S., Cao, R., Artiaga, R., and García, A., New Method for Material Classication from TGA Data by Nonparametric Regression . Materials Science Forum,514{ 516:1452{1456,2006. [18] Ogden, R. T.,Miller, C. E.,Takezawa, K.,Ninomiya, S., Functional regression in crop lodging assessment with digital images. Journal of Agricultural, Biological, and Environmental Statistics, 7(3):389{402, 2002. [19] Poskitt, D.,Presnell, B.,and Hall, P., A functional data-analytic approach to signal discrimination. Technometrics, 23:73{102, 2001. [20] Ramsay, J. O.,Li, X., Curve registration. Journal of the Royal Statistical Society, Series B: Statistical Methodology, 60:351{363, 1998. [21] Rossi, F.,Conan-guez, B., Functional multi-layer perceptron: a nonlinear tool for functional data analysis. In Neural Networks, pages 45{60, 2005. [22] Rossi, F.,Villa, N., Support vector machine for functional data classication. EEG NEUROCOMPUTING, 69:730-742, 2006. [23] Silverman, B. W., Incorporating parametric effects into functional principal components analysis. Journal of the Royal Statistical Society, Series B: Methodological, 57:673{689, 1995. [24] Silverman, B. W.,Ramsay, J. O., Functional Data Analysis. Berlin:Springer-Verlag, 1997. [25] Silverman, B. W.,Ramsay, J. O., Applied Functional Data Analysis:Methods and Case Studies. Berlin:Springer-Verlag, 2002. [26] Wang, X.,Rossi, N.,Ramsay, J. O., Nonparametric item response function estimates with the EM algorithm. J. Educational and Behavioral Statistics, 27:291{317, 2002.
描述:	碩士國立政治大學統計學系 96354020
資料來源:	http://thesis.lib.nccu.edu.tw/record/#G0096354020
数据类型:	thesis
显示于类别:	[統計學系] 學位論文

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