聯合模型之參數估計─軟體MATLAB套件JointModel與軟體R套件JM之比較

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翁金龍(Jin-long Wong) 查詢紙本館藏

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統計研究所

論文名稱

聯合模型之參數估計─軟體MATLAB套件JointModel與軟體R套件JM之比較
(Parameters Estimation of Joint Model─Comparison between the JointModel package of MATLAB and the JM package of R)

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摘要(中)

在生物醫學研究的過程中，經常收集到與時間有關的長期追蹤共變數，若將存活資訊與長期追蹤資料分開進行分析，可能會造成不當的推論。聯合模型將長期追蹤資料與存活資訊同時納入分析，使得估計量具有一致性(consistency)、有效性(efficiency)以及漸進常態(asymptotic normality)的良好性質。Cox聯合模型是最為廣泛使用的，當資料不符合Cox比例風險假設時，則以AFT聯合模型(the joint accelerated failure time model)當作替代。在參數的估計方面，結合長期追蹤資料與存活資訊以建立聯合概似函數，使用EM演算法(expectation-maximumalgorithm)做參數之估計。隨著聯合模型發展，已有許多軟體可以直接進行聯合模型分析：軟體R發展了套件：JM(2008)、Tseng & Yang (manuscript)提供了軟體MATLAB的套件：JointModel，此兩個軟體套件在參數估計時，所使用的方法略有差異，我們將以模擬的方式，對兩者進行比較。最後。藉由地中海果蠅資料進行實例估計。

摘要(英)

In clinical research studies, the longitudinal data which pays much attention in recent decade collects the observed event time of interest, called failure time or survival time, along with longitudinal covariates. These outcomes are often separately analyzed and lead us to make biased inferences. Thus, a joint modeling approach is necessarily used to analysis these two parts simultaneously. The estimators obtained from joint model have nice properties, such as consistency, efficiency, and asymptotic normality. The joint Cox model is a popular approach for analyzing survival data, and the joint accelerated failure time model is an alternative approach when the Cox proportional hazard assumption fails. In the part of parameter estimation, we link the longitudinal data and event time, and use the expectation-maximum algorithm to search for the maximum likelihood estimates. There are a code, JM, proposed in the R environment (2010), and a program package of MATLAB, JointModel, proposed by Tseng and Yang (2012 manuscript). We will compare JM and JointModel by simulation studies and apply both packages to analyze the Mediterranean fruit fly data.

關鍵字(中)

★ 聯合模型
★ 長期追蹤資料
★ EM演算法
★ JM
★ JointModel

關鍵字(英)

★ JointModel
★ EM algorithm
★ JM
★ Joint Model
★ Longitudinal data

論文目次

摘要..............................................I
英文摘要.............................................II
目錄................................ ..........III
表目錄.................................. ...........V
第一章緒論..........................................1
1-1 研究動機與背景....................................1
1-2 研究目的..........................................5
第二章統計方法......................................7
2-1 符號定義..........................................7
2-2 長期追蹤資料模型..................................8
2-3 Cox比例風險模型..................................10
2-4加速失敗時間模型(AFT模型).........................11
2-5 參數估計.........................................12
第三章軟體R之套件JM與軟體MATLAB之套件JointModel.....20
3-1 軟體R之套件JM....................................20
3-2 軟體MATLAB之套件JointModel...........................................23
第四章統計模擬......................................27
4-1 Cox聯合模型模擬..................................27
4-2 AFT聯合模型模擬..................................32
第五章實例分析......................................39
5-1 Cox聯合模型實例分析..............................39
5-2 AFT聯合模型實例分析..............................41
第六章結論與討論....................................43
參考文獻.............................................45

參考文獻

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指導教授

曾議寬(Yi-Kuan Tseng)

審核日期

2012-6-26

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