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Register a new userTesting the Stability of Systematic Risk Coefficient of the Stocks Listed in Damascus Securities Exchange
اختبار مدى استقرار معامل المخاطرة المنتظمة للأسهم المسجلة في سوق دمشق للأوراق المالية
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منذر مرهج( باحث )
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إنّ الهدف من هذا البحث هو اختبار مدى استقرار قيم معاملات المخاطرة المنتظمة للأسهم المسجلة في سوق دمشق للأوراق المالية، وتقرير إمكانية الاعتماد على قيمها المقدّرة في حساب معدّلات العوائد المطلوبة على الاستثمارات الفردية في تلك الأسهم أو على محافظ الاستثمار المشكّلة منها. وقد قام الباحث بجمع البيانات المطلوبة (أسعار إقفال المؤشر العام لسوق دمشق للأوراق المالية والأسهم المسجلة فيه) خلال الفترة الممتدة من 4/1/2010 ولغاية 28/10/2013 من خلال الموقع الالكتروني للسوق. تمّ استخدام البيانات لتقدير قيم معاملات المخاطرة المنتظمة (بيتا) للأسهم المدروسة، ومن ثمّ اختبار مدى استقرار القيم المقدّرة لمعاملات بيتا للأسهم اعتماداً على أسلوب استخدام الزمن كمتغير في دالة الانحدار المستخدمة لتقدير قيم معاملات بيتا وذلك خلال كامل فترة الدراسة وخلال ثلاث فترات جزئية جرى تقسيمها بحيث تشمل كل منها خمس فترات ربع سنوية، وقد تمّ بعد ذلك الحكم على مدى استقرار قيم المعاملات المختبرة اعتماداً على نتائج اختبار معنوية معاملات متغير الزمن المستخدم. وقد توصل الباحث إلى نتائج تفيد بميل غالبية معاملات المخاطرة المنتظمة للأسهم المدروسة إلى الاستقرار عبر الزمن وبنسبة تفوق الـ 80% منها، مما يعني إمكانية الاعتماد على قيم بيتا المقدّرة لحساب معدّل العائد المطلوب على أيّ سهم فردي أو محفظة استثمارات مشكّلة من تلك الأسهم المسجلة في سوق دمشق للأوراق المالية، وبالتالي اتخاذ القرار الاستثماري المناسب بناءً على ذلك.
The objective of this research is to test the stability of systematic risk coefficients of stocks listed on the Damascus Securities Exchange through the period (4/1/2010 – 28/10/2013), and therefore the ability to use the values of these coefficients to calculate the required rate of return on investment in the individual stocks and portfolios. The data related to the closed prices of stocks and market index were collected from the website of DSE, which is used to estimate the values of systematic risk (Beta). Then the researcher has tested the stability of the coefficients throughout the entire period and the three sub-periods each one consists of five yearly quarters by using the time as a variable in the regression model, and by testing the significance of the coefficient of time variable. The results of the research show that greater than 80% of these coefficients were insignificant, that is, the higher percentage of stocks have a stable Beta, and can be used to calculate the required rate of return on investment, therefore suitable investment decisions may be made upon these results.
References used
BODIE, ZVI, ALEX KANE, and ALEN J. MARCUS, "Essentials of Investments, 5 th edition, Mc Graw Hill, 2003
DAS, SROMON, " Testing the Stability of Beta Over Market Phases, An Empirical Study in the Indian Context", Working Paper, India, New Delhi, 2008
DAVES, PHILLIP R., MICHAEL C. EHRHARDT and ROBERT A. KUNKEL, "Estimating Systematic Risk: The Choice of Return Interval and Estimation Period", Journal of Financial and Strategic Decisions, Vol. 13, No. 1, 2000, PP. 7-13
GOZDE, ALTINSOY, "Time Varying Beta Estimation for Turkish Real Estate Investment Trusts: An Analysis of Alternative Modeling Technique", Master Thesis, Middle East Technical University, Turkey, 2009
IRALA, LOKANADHA REDDY, "Stationarity and Regression Tendencies of Security and Portfolio Betas in India", Working Paper No. 2007/02/A, Dhruva College of Management, 2007
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The research examines the Capital Asset Pricing Model
(CAPM) in Damascus Stock Exchange (DSE), by using the
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period of (2010-2013), and the monthly excess return of (DSE)
index (DWX)
for the same period.
The researcher concluded that there is a significant relation
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The researcher recommended that this study should be retested
when there are a suitable number of listed companies in order to
form portfolios that can diversify away the effect of the unsystematic risk of each company, and to retest the CAPM after
the crises, because the average excess returns for all of the
examined companies were negative. Finally, the researcher
recommended trying other models of asset pricing such as
Arbitrage Pricing Theory (APT), and (Fama) Multifactor Model.
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the autocorrelation test, the runs test and the GARCH model. To
take the impact of the Syrian crisis into account when judging the
efficiency of the market, the study period was divided into three
periods, the pre-crisis period, the crisis period and the whole period.
The results revealed inability to reject the weak form efficient
market hypothesis for more than half of the studied firms. Also it
showed that the Syrian crisis, in general, has negatively affected the
efficiency of most of the studied firms.
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also no relationship between credit losses reserve ratio and
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efficiency, On order to reducing credit risk and improve DSE
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