Copula理論在我國(guó)上市公司債券與股票間相關(guān)結(jié)構(gòu)分析中的應(yīng)用
本文選題:聯(lián)動(dòng)效應(yīng) + Copula; 參考:《華中科技大學(xué)》2012年碩士論文
【摘要】:金融風(fēng)險(xiǎn)間的聯(lián)動(dòng)效應(yīng)是近年來學(xué)術(shù)界和實(shí)務(wù)界關(guān)注的熱門課題,在此背景下,本文重點(diǎn)探討中國(guó)金融市場(chǎng)中信用風(fēng)險(xiǎn)與市場(chǎng)風(fēng)險(xiǎn)間的聯(lián)動(dòng)效應(yīng),以考察我國(guó)金融市場(chǎng)的風(fēng)險(xiǎn)配置效率?紤]到兩者之間可能存在的非線性相關(guān)關(guān)系,本文應(yīng)用研究非線性關(guān)系強(qiáng)有力的統(tǒng)計(jì)技術(shù)Copula函數(shù)來研究?jī)烧咧g的相關(guān)結(jié)構(gòu),本文的研究對(duì)我國(guó)的金融市場(chǎng)參與者具有一定的參考價(jià)值。 本文首先介紹了Copula函數(shù)的概念和性質(zhì),并重點(diǎn)研究了幾種重要的相關(guān)性測(cè)度,接著對(duì)在本文中有重要應(yīng)用的三種Archimedean Copula函數(shù)進(jìn)行了詳細(xì)介紹,并研究了它們?cè)诮鹑谑袌?chǎng)相關(guān)性分析中的特點(diǎn)。最后,本文介紹了Copula函數(shù)的參數(shù)估計(jì)以及模型選擇理論。 在實(shí)證研究部分,本文利用我國(guó)47家發(fā)行有公司債的上市公司2010年1月1日至2011年4月1日的交易數(shù)據(jù),結(jié)合Copula函數(shù)相關(guān)理論,以債券利差和股票收益波動(dòng)率分別作為信用風(fēng)險(xiǎn)和市場(chǎng)風(fēng)險(xiǎn)的代理變量,考察了我國(guó)上市公司債券利差與股票收益波動(dòng)率間的相關(guān)結(jié)構(gòu),試圖找到我國(guó)金融市場(chǎng)中不同風(fēng)險(xiǎn)之間會(huì)產(chǎn)生聯(lián)動(dòng)效應(yīng)的證據(jù),但實(shí)證分析發(fā)現(xiàn),,兩者之間并不存在確定的相關(guān)關(guān)系,本文對(duì)此做出了解釋并給出了相應(yīng)的政策建議;研究還發(fā)現(xiàn),信用評(píng)級(jí)低的公司兩者之間更傾向于正相關(guān),表明這類公司更易產(chǎn)生風(fēng)險(xiǎn)聯(lián)動(dòng)效應(yīng);最后,在模型選擇部分,研究發(fā)現(xiàn),Gumbel Copula是對(duì)現(xiàn)實(shí)數(shù)據(jù)擬合能力最好的模型。
[Abstract]:In recent years, the linkage effect of financial risk is a hot topic in academic and practical circles. Under this background, this paper focuses on the linkage effect between credit risk and market risk in Chinese financial market. In order to investigate the risk allocation efficiency of our financial market. Considering the possible nonlinear correlation between the two, this paper applies the powerful statistical technique Copula function to study the correlation structure between the two. The research of this paper has certain reference value to the financial market participant of our country. In this paper, the concept and properties of Copula function are introduced, and several important correlation measures are studied. Then, three kinds of Archimedean Copula functions which have important applications in this paper are introduced in detail. And studied their characteristics in the financial market correlation analysis. Finally, the parameter estimation and model selection theory of Copula function are introduced. In the part of empirical research, this paper uses the transaction data of 47 listed companies with corporate bonds issued in our country from January 1, 2010 to April 1, 2011, and combines with the relevant theory of Copula function. Taking bond spread and stock return volatility as proxy variables of credit risk and market risk respectively, this paper investigates the correlation structure between bond interest margin and stock return volatility of listed companies in China. This paper tries to find evidence that there is linkage effect between different risks in China's financial market, but the empirical analysis shows that there is no definite correlation between them. It is also found that the companies with low credit rating tend to be positively correlated, indicating that they are more prone to risk linkage. Finally, in the selection of models, it is found that Gumbel Copula is the best model to fit the real data.
【學(xué)位授予單位】:華中科技大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2012
【分類號(hào)】:F832.5;F224
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