Quản lý rủi ro thị trường: Nghiên cứu mô hình biến động trên thị trường chứng khoán Việt Nam

Luận văn thạc sĩ nghiên cứu ueh management of market risk case study of modelling volatility in vietnam stock market, đánh giá hiện trạng, phân tích vấn đề, đề xuất biện pháp hoàn

Chuyên ngành

Business Administration

Người đăng

Ẩn danh

Thể loại

Thesis

2012

96
2
0

Phí lưu trữ

35 Point

Mục lục chi tiết

I.1. Background of the Thesis

I.2. Research Questions and Objectives

I.2.1. Research Questions

I.2.2. Research Objectives and Implications

I.3. Vietnam Stock Market Overview

I.3.1. Introduction

II.1. The Characteristics of Volatility in Financial Market

III.1. DATA AND METHODOLOGY

III.1.1. Histogram and Statistics Definition

III.1.2. Descriptive Statistics of Return Series for the Period before Crisis

III.1.3. Descriptive Statistics of Return Series for Crisis Period

III.1.4. Descriptive Statistics of Return Series for Recovering Period

III.1.5. Descriptive Statistics of Return Series for the Whole Period

III.2. Testing for ARCH Effects

IV.1. Testing for ARCH Effect

IV.2. Empirical Results of Different Periods

IV.2.1. Empirical Results of the Period before Crisis
IV.2.2. Empirical Results of the Crisis Period
IV.2.3. Empirical Results of the Recovering Period
IV.2.4. Empirical Results of the Whole Period of Vietnam Stock Market

V. SUMMARY AND IMPLICATIONS

V.1. Summary and Implications

V.2. Limitations and Recommendations for Further Research

Appendix-1: Testing for ARCH Effect

appendix.1.1. Before Crisis Period (From March, 2002 to December, 2007)

appendix.1.2. Appendix-2: GARCH Models Analysis

appendix.1.2.1. Before Crisis Period (From March, 2002 to December, 2007)

Trích đoạn nội dung tài liệu

MINISTRY OF EDUCATION AND TRAINING UNIVERSITY OF ECONOMICS HO CHI MINH CITY    MASTER OF BUSINESS ADMINISTRATION MANAGEMENT OF MARKET RISK: CASE STUDY OF MODELLING VOLATILITY IN VIETNAM STOCK MARKET    BY LAM VAN BAO DAN HO CHI MINH CITY – 2012 LUAN VAN CHAT LUONG download : add luanvanchat@agmail.com MINISTRY OF EDUCATION AND TRAINING UNIVERSITY OF ECONOMICS HO CHI MINH CITY FALCULTY OF BUSINESS ADMINISTRATION    MASTER OF BUSINESS ADMINISTRATION MANAGEMENT OF MARKET RISK: CASE STUDY OF MODELLING VOLATILITY IN VIETNAM STOCK MARKET    BY LAM VAN BAO DAN SUPERVISOR VO XUAN VINH 2012 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Business Administration LUAN VAN CHAT LUONG download : add luanvanchat@agmail.com Master of Business Administration Lam Van Bao Dan CERTIFICATION “I certify that the substance of this thesis has not already been submitted for any degree and is not being currently submitted for any other degree. I certify that, to the best of my knowledge, any help received in preparing this thesis, and all sources used have been acknowledged in this thesis” LAM VAN BAO DAN Date: 25th April, 2012 K17-EMBA Page 2 2012 LUAN VAN CHAT LUONG download : add luanvanchat@agmail.com Master of Business Administration Lam Van Bao Dan Abstract The thesis concerns with market risk management. It has implications for businesses and investors, especially those hold investment in stocks. In particular, the thesis investigates the technique to model stock volatility in Vietnam stock market. The rapid growth of Vietnam stock market recently has received a great attraction of local and global investors. However, like other emerging stock markets, this growth has accompanied with high risk. Over the past thirty years, a huge number of articles have discussed the volatility of stock returns in developed and emerging capital markets. Unfortunately, even though Vietnam stock market has started trading from 2000, there has been relatively little work done on modelling and forecasting the return volatility in Vietnam stock market. This thesis employ the GARCH type models, both symmetric and asymmetric including ARCH (1), GARCH (1,1), GARCH-M (1,1), EGARCH (1,1) and TGARCH (1,1) to examine the sufficient models for capturing the characteristics of the return volatility in Vietnam stock market. The data set of VN-Index over nine year period from March, 2002 to December, 2011 which divided into four periods including before crisis, crisis, recovering and whole period. The findings suggest the sufficiency of ARCH (1), GARCH (1,1) and GARCH-M (1,1) models in capturing properties of conditional variance in Vietnam stock market. The results also provide the indicator of the risk-reward relationship and show the weak evidence of asymmetry in the return series in Vietnam stock market. K17-EMBA Page 3 2012 LUAN VAN CHAT LUONG download : add luanvanchat@agmail.com Master of Business Administration Lam Van Bao Dan Table of Contents Page I.1 Background of the Thesis.2 Research Questions and Objectives.2 Research Objectives and Implications .3 Vietnam Stock Market Overview .4 Outline of the Thesis .2 The Characteristics of Volatility in Financial Market . DATA AND METHODOLOGY .1 Histogram and Statistics Definition .2 Descriptive Statistics of Return Series for the Period before Crisis .3 Descriptive Statistics of Return Series for Crisis Period .4 Descriptive Statistics of Return Series for Recovering Period .5 Descriptive Statistics of Return Series for the Whole Period .2 Testing for ARCH Effects . 46 K17-EMBA Page 4 2012 LUAN VAN CHAT LUONG download : add luanvanchat@agmail.com Master of Business Administration Lam Van Bao Dan IV.1 Testing for ARCH Effect .2 Empirical Results of Different Periods .1 Empirical Results of the Period before Crisis .2 Empirical Results of the Crisis Period .3 Empirical Results of the Recovering Period .4 Empirical Results of the Whole Period of Vietnam Stock Market . SUMMARY AND IMPLICATIONS .1 Summary and Implications .2 Limitations and Recommendations for Further Research .1 Appendix-1: Testing for ARCH Effect .1 Before Crisis Period (From March, 2002 to December, 2007) .2 Appendix-2: GARCH Models Analysis .1 Before Crisis Period (From March, 2002 to December, 2007) . 89 K17-EMBA Page 5 2012 LUAN VAN CHAT LUONG download : add luanvanchat@agmail.com Master of Business Administration Lam Van Bao Dan List of Tables Table No. Description Page Table 1 Price limitations in HOSE over different periods 16 Table 2 Summary for estimation results of before crisis period 60 Table 3 Summary for estimation results of crisis period 60 Table 4 Summary for estimation results of recovering period 61 Table 5 Summary for estimation results of whole period 61 List of Figures Figure No. Description Page Figure 1 Number of listed company from 2000 to 2011 14 Figure 2 Market capitalization from 2000 to 2011 14 Figure 3 Number of securities companies from 2000 to 2011 15 Figure 4 Number of trading accounts from 2000 to 2011 15 Figure 5 Performance of VN-Index from 2000 to 2011 17 Figure 6 Performance of VN-Index in 2007 18 Figure 7 Performance of VN-Index in 2009 18 Histogram of daily return series of VN-Index Figure 8 40 (01/03/2002 – 28/12/2007) Figure 9 Histogram of daily return series of VN-Index 41 (02/01/2008 – 31/12/2009) Figure 10 Histogram of daily return series of VN-Index 42 (04/01/2010 – 30/12/2011) Figure 11 Histogram of daily return series of VN-Index 43 (01/03/2002 – 30/12/2011) K17-EMBA Page 6 2012 LUAN VAN CHAT LUONG download : add luanvanchat@agmail.com Master of Business Administration Lam Van Bao Dan Acknowledgement I would like to say special thanks to my supervisor, Dr. Vo Xuan Vinh for his helpful directions, encouragements and valuable comments in preparing this thesis. I would like to thank all lecturers in EMBA program, especially to Dr. Tran Ha Minh Quan for his help. I would also like to thank all my friends in the program for supporting and encouraging me to finish this thesis. Finally, special thanks also go to my wife and my family for their love and staying beside me during my study. K17-EMBA Page 7 2012 LUAN VAN CHAT LUONG download : add luanvanchat@agmail.com Master of Business Administration Lam Van Bao Dan I.1 Background of the Thesis Investing in emerging stock markets can make a large return but also creates a big loss for businesses because of high volatility (high risk). Therefore, finding a technique to model volatility is important for businesses and investors investing in stock market. This thesis will investigate the volatility models which best fits the Vietnam stock market conditions. Modelling volatility will help businesses and investors understand and better manage risks involved in their investment. Volatility is more and more important in financial market. There are a huge number of researches and discussions for volatility in the past thirty years and especially in the recent years. This is because volatility is a special indicator in financial market. It is a key factor in many securities pricing formula as well as the value-at-risk models. Even though volatility is unobservable, it plays an important role in making investment decision. On the other hand, it is also the interest of the policy makers in financial markets. The policy makers are interested in the impact of volatility on the stability of the financial market and hence on the economy. Because of the above implications, volatility is the focus of several studies for estimation and forecast. The volatility index (VIX) and Nasdaq Volatility Index (VXN) that defined as a weighted of prices for a range of options on the S&P 500 index and the Nasdaq 100 index have started trading from 2006. It is calculated in real time by Chicago Board Option Exchange (CBOE). These are two of the world’s most popular index of investors concerning to future stock market volatility. The goal is to estimate the implied volatility of the stock market over the next 30 days. It is proven that the low volatility index, the high trader confidence. There are a lot of models that can be implied for modelling and forecasting volatility including ARCH/GARCH models and non-GARCH models. However, ARCH model K17-EMBA Page 8 2012 LUAN VAN CHAT LUONG download : add luanvanchat@agmail.com Master of Business Administration Lam Van Bao Dan proposed by Engle (1982) and generalized by Bollerslev (1986) are said to be most sufficient for capturing the characteristics of the time varying stock return volatility. From the introduction of the GARCH model, a huge number of GARCH extensions or GARCH family such as GARCH in mean (GARCH-M) (Bollerslev, 1986), EGARCH (Nelson, 1991), Threshold GARCH (TGARCH) (Glosten, Jagannathan and Runkle, 1993), Asymmetric GARCH model (AGARCH) (Engle, 1990), etc. have been studied and proven to be sufficient for modelling and forecasting stock return volatility. However, different papers support different models and show the conflicts in implication. The empirical results argue that different models are suitable for different markets and in different time periods. Therefore, we will employ several widely accepted GARCH models including ARCH, GARCH, GARCH-M, TGARCH and EGARCH to investigate the volatility of Vietnam stock market in this thesis. From the results of the study, we will suggest the sufficient GARCH models for capturing the properties of return volatility in Vietnam stock market. There have been numerous researches focusing on modelling stock price volatility. However, most of them have discussed about the developed capital markets. The emerging markets have not received much attention. Recently, the emerging markets, especially the fast development countries such as China, Brazil, India, Russia, Mexico and the ASEAN countries has increasingly attracted the investors to diversify their portfolios. Vietnam stock market has just been traded more than ten years. It has significantly developed in recent years and has received a great attraction of many investors, both local and foreign. They made considerable amount of profits during the boom time of 2006-2007. However, the market went down in 2008 and 2009 due to the effect of world financial crisis that results in a big loss for many businesses and investors. K17-EMBA Page 9 2012 LUAN VAN CHAT LUONG download : add luanvanchat@agmail.com Master of Business Administration Lam Van Bao Dan Comparing with the other stock markets in the region, Vietnam stock market is a small and young market. It has the typical characteristics of the young emerging financial market such as illiquidity of stock, incomplete legal system, unstable investors and sensitive to financial shocks. It is a promising stock market but requires high risk management technique to avoid the unexpected shocks. The data set to be used in this thesis is the daily VN-Index of Ho Chi Minh City stock exchange (HOSE). The sufficient source of data is received from the data base of Vietnam stock market news and information official website (www.vn) and Vietcombank Securities Company Ltd. The time period of the data set is from March, 2002 to December, 2011 which is the time of this study. The reason for choosing the data set from March, 2002 instead of July, 2000 (starting time of trading of Ho Chi Minh City Securities Trading Center (HOSTC)) is that there were only three trading days per week before March, 2002. The world financial crisis in 2008 and 2009 has negative impacted on the stock markets around the world and Vietnam is one of the most critical impacted countries. The impact of the crisis to Vietnam stock market was clearly reflected on the VN- Index of Ho Chi Minh City Stock Exchange. The VN-Index went down unbreakable from 1,002.7 on 15th November, 2007 to the bottom of 235.5 on 24th February, 2009. Even though the VN-Index has recovered from the end of 2009 but it has not reached to haft of the peak value at 1,170.68 on 12th March, 2007. To provide a more accuracy analysis, the data set will be splitted into four periods including before 2008 (before crisis period), from 2008 to 2009 (crisis period), from 2010 to 2011 (recovering period) and from 2002 to 2011 (whole period of Vietnam stock market). We will examine whether the applied GARCH models are sufficient for Vietnam stock market in different periods.

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