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姓名 張滋顯(Tzu-Hsine Chaung) 查詢紙本館藏 畢業系所 統計研究所 論文名稱 加速失敗與長期追蹤聯合模型分析– 肝硬化之實例研究
(Joint modelling of accelerated failure time and longitudinal data– A case study in cirrhosis data)相關論文 檔案 [Endnote RIS 格式] [Bibtex 格式] [相關文章] [文章引用] [完整記錄] [館藏目錄] [檢視] [下載]
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摘要(中) 存活分析中,Cox比例風險模型為最普遍的存活模型,但當資料沒有通過比例風險假設時,可使用其他的風險模型作為代替,常見的為加速失敗模型,在使用加速失敗模型描述長期追蹤資料中共變數與存活時間之間的關係時,存在著測量誤差與測量時間不固定的問題,同時資料缺失(informative missing)也會造成估計發生偏誤。為了解決這些問題,我們引進長期追蹤模型,利用線性隨機效應模型描述長期追蹤資料,使用概似比檢定與AIC值選擇適合的模型,解決這些問題,結合加速失敗模型與長期追蹤資料模型,也就是聯合模型。聯合模型的參數估計方面,由於使用線性隨機效應模型,將隨機效應視為遺失值,因此對聯合模型的概似函數使用EM(expectation maximization algorithm)演算法估計參數,且由於直接估計參數標準差不易,採用拔靴法估計參數標準差。由於近年來發現,少數資料使用Cox模型與加速失敗模型配適會得到不同的結果,本文使用加速失敗風險模型的聯合模型配適哥本哈根(Copenhagen)的研究團隊(Schlichting et al.,1983)肝硬化資料,分析強體松對肝硬化患者之療效,且將結果與使用Cox模型所得的結果進行比較。 摘要(英) In survival analysis, the most common semi-parametric survival model is Cox proportional hazards model, if the proportional hazards assumption fail, we can use other hazards model to be an alternative model. The accelerated failure time model is an attractive alternative model. When we describe the relationship between longitudinal data and survival time, there exist some problems of measurement error and incomplete covariate history that result in biased estimation for partial likelihood function. In order to solve these problems, we introduce the joint model approach. The model parameter estimation of joint model cannot be obtained directly through the joint likelihood function because the integral outside the likelihood function. Therefore, we conduct EM (expectation maximization algorithm) algorithm to estimate the parameters to overcome the difficulty. Since the standard deviation is not easy to estimate the parameters directly, we use the bootstrap procedure to estimate the standard deviation. In recent literature, data fitted by Cox model or accelerated failure model may lead to different results. Therefore, we use the accelerated failure time model to fit the cirrhosis data and compare the results with the ones obtained Cox model. 關鍵字(中) ★ 聯合模型
★ 長期追蹤資料
★ 比例風險模型
★ 加速失敗模型關鍵字(英) ★ joint model
★ longitudinal data
★ Cox model
★ AFT model論文目次 摘要 i
Abstract ii
誌謝詞 iii
目錄 iv
圖目錄 vi
表目錄 vii
第一章 緒論 1
1.1疾病介紹 1
1.1.1病因 1
1.1.2診斷指標 4
1.1.3治療方法 6
1.2研究背景 8
第二章 統計方法 13
2.1 聯合模型 14
2.1.1 線性混合隨機效應模型 14
2.1.2 加速失敗模型(accelerated failure time model) 14
2.1.3 聯合模型(The Joint Model) 16
2.1.4 MCEM演算法(The MCEM Algorithm) 17
2.1.5 標準差與平均值的估計 23
第三章 實例分析 24
3.1資料介紹 24
3.2 Kaplan-Meier曲線 26
3.3 比例風險檢定 31
3.4 AUC 34
3.5 聯合模型 38
第四章 結論與討論 45
參考文獻 47
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17. 葉秋梅 (2009)。聯合長期追蹤與存活資料分析-肝硬化病患之實例研究。 國立中央大學統計學研究所碩士論文。
指導教授 曾議寬(Yi-Kuan Tseng) 審核日期 2014-7-22 推文 facebook plurk twitter funp google live udn HD myshare reddit netvibes friend youpush delicious baidu 網路書籤 Google bookmarks del.icio.us hemidemi myshare