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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

結合專家意見與隨機方法:台灣生育率推估 / Combining Expert Opinion with Stochastic Forecast: A Study of Taiwan Fertility Projection

李政豫 Unknown Date (has links)
政府制訂與規劃政策,需要未來人口數或人口結構的資訊,以期能針對國家需求對症下藥;預測未來人口總數及人口結構通稱為人口推估(Population Projection),台灣的官方人口推估由行政院經濟建設委員會負責。人口推估通常使用人口變動要素合成法(The Cohort Component Method),根據現有人口總數及結構,加上對未來生育(Fertility)、死亡(Death)、遷移(Migration)三要素的預期,推估出未來的人口數及其結構;除了參考歷史資料外,目前三要素大多參考專家意見(Expert opinion)決定變動範圍。 在三要素之中,生育和遷移由於變動趨勢較大,較不容易以歷史資料找出趨勢,過去大多倚賴專家意見進行生育和遷移的假設。但專家意見也有蒐集上的疑慮,例如意見沒有固定的形成格式,推估結果也難以機率角度詮釋發生可能性,亦即推估數值大多不隨時間波動。為了彌補專家意見的不足,近年不少國家的人口推估使用隨機方法(Stochastic Methods),大致可分為三種:隨機推估法(Stochastic Forecast)、模擬情境法(Random Scenario Method)和推估誤差法(ex post Method),這三種方法可組合使用,例如Lutz (1995)合併隨機推估和模擬情境,而郭孟坤與余清祥(2008)則是以隨機推估和推估誤差的組合來進行推估,使隨機方法更具有彈性,適用於不同情境的人口推估。 本文目的在於結合專家意見與隨機方法,希冀綜合兩者的優點,提出適用於台灣的人口推估方法。首先,本文提出將專家方法數量化的幾種作法,配合德菲法蒐集專家意見,先以電腦模擬找出較佳的數量化方法;接著再參考由歷史資料及隨機方法(區塊拔靴法)得出的推估結果,分別以主觀角度、貝氏分析(Bayesian Analysis)和貝氏可信度(Bayesian Credibility)的角度進行加權平均,結合專家意見及隨機方法的推估。
2

應用專家意見評估金融市場上專家價值之研究

楊昇達, Yang, Sheng Ta Unknown Date (has links)
近年來,投資理財的重要性與日俱增;但是,一般投資大眾往往無法掌握市場運作產生的資料、資訊;一方面是因為市場上流動的資訊過多,投資大眾很難有效篩選有幫助的資訊。另一方面則是因為投資人無法了解資料的涵義;因此,聽從某些專家的意見進行投資,可能是沒有時間與信心自行研究的一般投資大眾最終選擇。但是這些市場上所謂的專家們數量眾多,提出的意見可信度究竟有多少;一般投資大眾應該採信那些專家的意見,以降低投資的風險與獲利。本研究將結合內容分析法(Content analysis)與分析網路程序法(Analytic Network Process),以專家提出的意見可信度來評估專家們的價值。預期提供投資人一個參考的依據,選擇價值較高的專家提出之意見進行研究,相信比起直接取用所有的專家意見進行分析,風險與成本會更為降低。 / Recent years, there is more and more importance in investing and managing finances. Because too many information and the investors do not understand what these data really mean, the investors do not have ability to help themselves investing and earning profit. For the investors without time or confidence, it may be the final choice that according to some opinions comes from some professors to invest. However, there are so many professors, which one’s opinion is more reliably and believable? As a general investor, will apply which opinions help us reduce risk and make profit? In this research we combine content analysis and analytic network process to evaluate the professors in the financial market by how much believable in their opinions. We expect that this will support the investor a reference materials. Comparing with analyzing all opinions in the market directly, the risk and cost will be lower if applying the opinions comes from some valuable professors.
3

專家意見評價結果與品質和主併公司股價關聯性-以台灣上市公司為例 / Appraisal Outcome & Quality In Fairness Opinion For Acquiring Firms

盧作倫, Lu, Tso Lun Unknown Date (has links)
本研究以2002年至2013年台灣主併公司為上市公司的併購案件為樣本,探討專家意見評價結果和品質對主併公司短期股價影響。本研究結果有兩項發現: 1. 於意見書揭露日時,若專家意見書評估價格高於雙方約定交易價格愈多時,即評價溢酬愈大,主併公司會有負向的累積異常報酬率。 2. 於意見書揭露日時,若併購溢酬越大、或是併購溢酬大與評價品質高,主併公司會有負向的累積異常報酬率。 故本研究認為,台灣獨立專家制度相較歐美國家仍不成熟,相關配套措施及規範未規畫周詳,對於獨立專家的獨立性、專業性之確保,以及出具意見時評價方法的選擇標準、意見書應記載事項等規範過少,使得專家意見書於揭露時評價結果易受到市場及投資人懷疑。另外評價品質與主併公司異常報酬的關聯性在少數的樣本下無法表現出顯著性,市場及投資人較傾向以併購溢酬做為交易出價是否過高之依據。 / This study analyses the relation between target firm appraisal outcome and quality disclosed in the fairness opinions and acquiring firm performances by using the samples of Taiwanese listed company in M&A transaction between 2002 and 2013. We find that the stock price reactions to the public disclosure of fairness opinions are negatively related to the difference between target firms valuations contained in the fairness opinion and the merger offer price. In addition, the greater the acquisition premium for or acquisition or high acquisition premium with high appraisal quality would result in negative stock price reactions as well. Under these conditions, this study suggests that Taiwan's independent expert system in Taiwan still appeared to be immature, including that related supplementary measures are not careful planned, the independence of the independent expert, the professionalism of independent expert, and the criteria of valuation methods are not carefully regulated by the government. Therefore, the outcome and the quality of the fairness opinion may not to be trusted by the market and investors. Also, the association between appraisal quality and abnormal unable to be significant could result from the lack of number of samples.

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