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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of Applied Research on Industrial Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Stock Return,Pricing Model,Market Return
- چکیده:
- چکیده انگلیسی: The purpose of this paper is to empirically test and evaluate the possibility of using the traditional Capital Asset Pricing Model (CAPM) and the Modified Capital Asset Pricing Model (MCAPM) in the Tehran Stock Exchange. Traditional CAPM by Sharpe-Linter (1965) as one of the ways in which investors can help explain the risk and return on investment offered by CAPM model to models of different MCAPM suggested by the Santosh Koirala (2015).Therefore, to achieve the desired objective, the research models using monthly returns of firm 96 (2009 to 2015) and test based on index of cash and capital gain returns. The results indicate that the explanatory power MCAPM more about stock returns compared to traditional CAPM in the Tehran Stock Exchange.
- انتشار مقاله: 08-02-1396
- نویسندگان: Ebrahim Abbasi,Meysam Kaviani,Ebrahim Farbod
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Medical Sciences
- نوع مقاله: Journal Article
- کلمات کلیدی: Antioxidants,Herbal Medicine,Hypoglycemic agents,Anethum graveolens
- چکیده:
- چکیده انگلیسی: The aim of this study was to assess the antiglycation and antioxidant properties of aqueous extract of Anethum graveolens (dill). In the in vivo and in vitro experiments, antioxidant properties, blood glucose, and AGEs formation were determined. Dill extract was given orally to healthy and diabetic rats. Our results illustrated that different concentrations of dill extract (0.125, 0.25, 0.5, and 1 mg/ml) have potential antiradical and antioxidant activity. Aqueous extract of dill significantly reduced AGEs formation and fructosamine levels, protein carbonyl and also thiol group’s oxidation, amyloid cross-β and fragmentation. After 2 months, blood glucose levels (P=0.006) and AGEs formation (P=0.003) significantly reduced in dill treated group compared with untreated diabetic animals. In conclusion, dill can be recommended as herbal medicine for the control and prevention of diabetic complications.
- انتشار مقاله: 30-10-1393
- نویسندگان: Ebrahim Abbasi Oshaghi,Iraj Khdadadi,Heidar Tavilani,Mohammad Taghi Goodarzi
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Finance
- نوع مقاله: Journal Article
- کلمات کلیدی: stock price Crash risk,Customer concentration,Bankruptcy Risk,employment risk
- چکیده:
- چکیده انگلیسی: The companies with major customers can supply a considerable source of cash flows by selling a large portion of their products to them. Since the lack of purchase, loss, or bankruptcy of major customers can result in a significant reduction in cash flows in the company, thus the risk is the companies with major customers is higher than other companies. Thus, the present study aimed to investigate the effect of customer concentration on company risks. For this purpose, the effect of customer concentration on three criteria of stock price crash risk, bankruptcy risk, and employment risk was studied. The research sample included 127 companies listed in the Tehran Stock Exchange during 2011-2018. Multivariate regression models with panel data were used by the random-effects method to test the research hypotheses. The research findings indicated that customer concentration has a significant positive effect on stock price crash risk, bankruptcy risk, and employment risk. In other words, stock price crash risk, bankruptcy risk, and employment risk are higher in the companies where the concentration of major customers is higher.
- انتشار مقاله: 28-01-1399
- نویسندگان: Ebrahim Abbasi,Ali Tamoradi
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Finance
- نوع مقاله: Journal Article
- کلمات کلیدی: Stock Returns,Financial development index,Monetary conditions index,TVP-DMA
- چکیده:
- چکیده انگلیسی: Stock return predictability has been extensively considered as a stylized reality. Theories indicate that returns should change along the time, and various studies have presented evidence on this point. On the other hand, there is an optimal portfolio in each regime, and one cannot claim that a specific portfolio can minimize risk and returns in each regime. On the other hand, the financial conditions index (FCI) is an important index to specify monetary policy conditions. Regarding the importance of the issue, this research aims to present a comprehensive index, including all monetary transmission mechanisms. In this regard, it is attempted to improve the efficiency of stock return predictability in Iran's economy by incorporating an FCI and identifying relationships between FCI and stock returns using the TVP-DMA model, which can resolve shortcomings of traditional models. The study is applied research in terms of purpose. Seasonal data over the period of April 1991 to July 2019 is used. The results based on TPV, DMS, and DMA models indicate that liquidity growth rate, economic growth rate, unemployment rate, exchange rate, financial condition index, oil revenues, misery index, and budget deficit, has significantly affected factors of stock returns in 30, 50, 11, 49, 66, 54, 7, and 84 periods of 104 periods, respectively. Accordingly, budget deficit, financial condition index, oil revenues, and economic growth are the most effective factors of stock returns predictability in Iran. Further, the incorporation of flexibility in coefficients of the financial development index leads to higher forecast accuracy.
- انتشار مقاله: 20-03-1399
- نویسندگان: Amin Sadat,Ebrahim Abbasi,Hasan Ghalibaf Asl
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Finance
- نوع مقاله: Journal Article
- کلمات کلیدی: Tehran Stock Exchange,Audit Committee,Related Parties Transactions,Firm Value
- چکیده:
- چکیده انگلیسی: In recent financial scandals, related parties transactions (RPTs) have been as one of the major concerns, so that the targeted use of these transactions and lack of their disclosure or insufficient disclosure are some of the factors in the failure of the corporates. In RPTs, there is a risk that the related party may be favoured with terms that could harm the interests of the company’s shareholders. The purpose of this study was to investigate the effects of different types of related parties transactions on the firm value with the moderating role of the audit committee incorporates listed in Tehran Stock Exchange. The research statistical sample consists of 100 listed firms in the Tehran Stock Exchange in 6 years of 2013-2018. This research, based on the nature and content, is a descriptive/ correlational research. Using Panel data and multiple regression, the results of the research show that there is a negative relationship between RPTs and the firm value. The findings also show that there is a positive relationship between the audit committee and the firm value. Also, the findings show that different types of RPTs have a different effect on the firm value. The results also show that the audit committee does not affect the relationship between RPTs and the firm value.
- انتشار مقاله: 25-08-1398
- نویسندگان: Majid Ashrafi,Ebrahim Abbasi,Seyed Ali Hosseini,Mahjoobeh Poor Etemadi
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of School Health
- نوع مقاله: Journal Article
- کلمات کلیدی: Serum Iron Status,Platelet Indices,High School Females
- چکیده:
- چکیده انگلیسی: Background: Platelet indices (PIs), including platelet count (PC), mean platelet volume (MPV), platelet distribution width (PDW), and platelet larger cell ratio (P-LCR) are used to predict clinical outcomes in patients with various medical conditions. The current study aimed at evaluating the correlation between serum iron saturation (IS) and PIs among the female students living in the Northwest of Iran. Methods: The current cross sectional study included 254 high school female (HSF) students aged 15 to 18 years in Hamadan, Iran, from September to January 2016. After completion of a questionnaire, the hematological parameters were determined using standard methods. HSF afflicted with infections and acute hemorrhage, and the ones with malignancies and inflammatory diseases were excluded. The correlation between the serum levels of IS and PIs in the female residents of Northwest of Iran was evaluated using the Pearson correlation test. Results: The reference range of PIs in healthy HSF in the Northwest of Iran was as follows: PC 241 ± 53 109/L, MPV 9.67 ± 0.88 fL, PDW 11.904% ± 1.68%, and P-LCR 22.908 ± 6.69 fL. Decreased IS and MPV resulted in increased PC in the current study population. An inverse correlation was observed between PC and IS (P < 0.05). There was no correlation between MPV, PDW, P-LCR, and IS (P > 0.05), but a linear correlation was observed between PDW and MPV (P < 0.001) as well as PDW and P-LCR (P < 0.001). Conclusions: The current study data indicated IS as one of the most important factors affecting PC. PIs can serve as a clue to the severity of iron deficiency in HSF. It is recommended to conduct complementary studies to identify prognostic and diagnostic utilities of PIs in clinical practices.
- انتشار مقاله: 11-10-1348
- نویسندگان: Hassan Rafieemehr,Mohammad Rafiee,Marzieh Mahmoodi,Ebrahim Abbasi Oshaghi
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Finance and Managerial Accounting
- نوع مقاله: Journal Article
- کلمات کلیدی: Portfolio optimization,Hybrid Algorithm,Black hole algorithm,Gravitational Research algorithm
- چکیده:
- چکیده انگلیسی: The main purpose of this research is portfolio optimization in Tehran securities exchange using the black hole algorithm and the Gravitational Research algorithm. We also propose an algorithm named Hybrid Algorithm which combines the two algorithms above to cover the weaknesses of these two algorithms. Finally we compare the results with the Markowitz model and choose the optimal algorithm.
In order to analyze the data that is the same information extracted from the TSE Client software and RahAvard Novin Software, MATLAB software version of 2016and GAMS and SPSS have been used.
This research is fulfilled in the period from 2011 to 2016. The method used in this study is based on the purpose of the applied research and based on the way of data collection as a descriptive research and correlation type, which is noticed with the retrospective and post-event approach and through the analysis of the observed information, attempts to optimize the portfolio using a black hole algorithm. In all the years of research, the hybrid method introduced in this research has obtained the nearest solution to the exact solution, which is the same Markowitz. In order to optimize the portfolio, black hole meta-heuristic algorithms, Gravitational Research and hybrid algorithm (hybrid) can be used instead of the Markowitz algorithm with higher accuracy and speed. The results of the present case study and other studies show that black hole algorithms, Gravitational Research, and hybrid algorithms are very quick in solving portfolio optimization problems- انتشار مقاله: 30-11-1397
- نویسندگان: Kaveh Mehrani,Amirmehdi Mirshahvalad,Ebrahim Abbasi
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Finance and Managerial Accounting
- نوع مقاله: Journal Article
- کلمات کلیدی: Independence of board of directors,Size of board of directors,chief executive officer duality,Real Earnings Management
- چکیده:
- چکیده انگلیسی: The purpose of this study is to evaluate the effect of the characteristics of board of directors (Chief Executive Officer Duality, CEO tenure duration, size and independence of the board of directors) on earnings management. In this study, data from 62 companies listed in the Tehran Stock Exchange during the years of 2011 to 2015 were used. The statistical method used in this research
is panel data and the multiple linear regression models were used to test the hypotheses. In this study, three models of real earnings management (real earnings management based on abnormal cash flows, real earnings management based on abnormal discretionary expenditure and real earnings management based on abnormal production costs) were considered. The results of the hypotheses test using panel data showed that from the four characteristics taken into consideration for the board of directors, duration of tenure of Chief Executive Officer on the board of directors (in all three models of real earnings management), the size of the board of directors (in real earnings management model based on abnormal discretionary expenditure ), the independence of the board of directors and CEO-duality (in real earnings management models based on abnormal production costs), have a significant impact on the real earnings management
- انتشار مقاله: 15-01-1396
- نویسندگان: Ebrahim Abbasi,Asghar Qomi
- مشاهده
- جایگاه : پژوهشی
- مجله: Advances in Mathematical Finance and Application
- نوع مقاله: Journal Article
- کلمات کلیدی: Algorithmic Trading,Buy and hold Strategy,Intelligent Trading Systems,Technical Analysis,Technical Analysis Indicators
- چکیده:
- چکیده انگلیسی: Technical analysis is one of the financial market analysis tools. Technical analysis is a method of anticipating prices and markets through studying historical market data. Based on the factors studied in this type of analysis, indicators are designed and presented to facilitate decision-making on buy and sell stress and then buy and sell action in financial markets. This research evaluates performances and returns of 10 conventional technical analysis indicators based on the strategies set on the total stock exchange index, the total index of OTC market and 8 other (non-correlated) industry indices by using Meta Trader software from 2008 to 2018. Also, the significance of the difference between the returns of the indicators is tested using the buy and hold strategy. The results show a significant difference between the returns using some of the technical analysis indicators in some indices and buy and hold strategy. The effectiveness of technical analysis strategies varies across industries and EMA and SMA with respectively 6 and 5 repetitions, are the best strategies and BB with just one repetition has the least repetition. The investment industry index with the most repetition is the industry in which the strategies used in this study have been able to provide an acceptable return.
- انتشار مقاله: 21-11-1398
- نویسندگان: Ebrahim Abbasi,Mohammad Ebrahim Samavi,Emad Koosha
- مشاهده