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姓名 蘇貫文(kuan-Wen Su)  查詢紙本館藏   畢業系所 工業管理研究所
論文名稱 T分配統計量轉換方法在偏斜分配下的衡量與比較
(Evaluate and compare the transformation of T-statistic with skewed data)
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摘要(中) 當母體分配為小樣本的常態分配時,通常使用T分配統計量建立信賴區間;然而當母體分配不為常態而是偏態分配時,若在偏態系數愈大且樣本數愈小的情況下,使用T分配統計量會造成誤差,為解決這項問題,許多學者提出將T分配統計量進行修正,期望透過修改後的T分配統計量以降低母體偏態造成的誤差,Zhou(2005)根據Hall(1992)的方法,提出修正後的T分配統計量,並證明其方法可以得到近似的覆蓋精度且信賴區間長度較短的結果,但其衡量與比較方法皆是以傳統的衡量指標進行,在衡量方法的優劣上容易發生相互矛盾的情形,假如追求高覆蓋機率,則會得到較長的信賴區間,反之若追求較短的信賴區間則會犧牲覆蓋機率,因此本文中將採用Yeh and Schemeiser(2015)提出的VAMP1RE 標準對Zhou(2005)、Hall(1992)提出的方法進行比較,該標準以Schruben (1980)提出的覆蓋值(Coverage value)為基礎,該標準將CIP的衡量分成偏離有效性以及無效模仿兩項指標,計算CIP與理想CIP的覆蓋值,取其平均平方誤差,並在不同樣本大小下對其結果進行分析。
摘要(英) When we are trying to construct a confidence interval with small sample size, we can use t-statistic construct the(1-α)100%confidence interval to evaluate the population mean if the data is independent and identical from normal distribution. If data comes from a skewed distribution, the coverage accuracy of t-statistic is poor. In order to solve this problem, Hall (1992) proposed the modified t-statistic to remove the effect of skewness and Zhou (2005) proposed a new t-statistic which he claim the new statistic can get shorter confidence interval length than Hall’s t-statistic. Zhou’s comparison is based on traditional criterion; it has some contradiction when we use it to measure the CIP is good or not (i.e. when we want a tighter confidence width, we will get less coverage probability, vice versa. We will use a new criterion to evaluate the CIP build by these authors, which proposed by Yeh and Schemeiser (2015) called VAMP1RE Criterion. The new Criterion is based on the coverage value which is proposed by Schruben (1980). VAMP1RE Criterion can be decomposing into two causes, Departure form Validity and Inability to mimic. VAMP1RE Criterion can be find by the coverage value of Ideal CIP and proposed CIP then calculate the mean-squared error of the two coverage value. We will use VAMP1RE Criterion to compare the t-statistic proposed by Zhou (2005)、Hall (1992) and Johnson (1978).
關鍵字(中) ★ T分配
★ 信賴區間
★ 蒙地卡羅模擬
關鍵字(英) ★ t-distribution
★ Confidence Interval
★ Monte Carlo Simulation
論文目次 Abstract ii
目錄 iii
表目錄 v
圖目錄 vi
一、 緒論 1
1-1 研究背景 1
1-1-1 T分配統計量 1
1-1-2 處理偏斜分配的方法 1
1-2 研究目的與動機 4
1-3 研究架構 5
二、 文獻回顧 6
2-1 信賴區間 6
2-2 傳統的CIP衡量指標 7
2-3 T分配統計量的轉換方法 8
2-4 VAMP1RE標準 9
2-5 覆蓋函數 11
2-6 拔靴法 12
2-7 蒙地卡羅法 14
三、 研究方法 16
3-1 轉換方法 16
3-2 VAMP1RE標準 16
3-2-1 基本概念 16
3-2-2 定義理想CIP 17
3-2-3 案例探討 18
3-3 研究流程 20
四、 實驗結果 21
4-1 指數分配結果 22
4-2 伽瑪分配結果 24
4-3 萊利分配結果 29
五、 結論 32
5-1 結論 32
5-2 未來展望 33
六、 參考文獻 34
七、 附錄 37
參考文獻
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ranking confidence-interval procedures., IIE Transactions., 2015, 47(11): 1203-1216.
24. 周心怡,拔靴法(Bootstrap)之探討及其應用,國立中央大學統計研究所,桃園市,2004,民國93年。
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指導教授 葉英傑(Ying-Chieh Yeh) 審核日期 2017-8-1
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