Advances in Mathematical Finance and Application (AMFA)

This study aimed to investigate the effect of fraction resulted of bad news on stock returns emphasizing the regulatory power of information disclosure policies that for this goal, the study population is consisted of the companies listed on the Tehran Stock Exchange during a five years' period (2010-2014). Data of selected statistical sample using systematic elimination method has been collected from 122 companies. This study objectively is a practical research. In terms of type of research design because of relying on historical data, is ex post facto and its inference method is inductive and in correlation type. This study includes six main hypotheses. In this study to assess the hypotheses, the linear regression has been used. To analyze the data and test hypotheses, the EVIEWS software is used. the results of this study suggest that the fraction resulted of bad news has an effect on stock returns, abnormal cumulative returns and the stock crash risk, as well as the fraction resulted of bad news has an effect on the interaction of regulatory power of information disclosure policies, stock crash risk, the abnormal cumulative returns and stock returns.

<span>The purpose of this study was to an investigation of financing costs factors on the auditor's qualified report in companies listed in Tehran stock exchange. The criteria considered in this study were the audit firm size, auditor's specialization in the partner level, auditor's selection tenure and audit fees. For this purpose, five hypotheses were developed and data related to 85 companies of Tehran stock exchange for the period 2009-2014 were used. To test them, the multivariate regression technique was applied to panel data. The results of the first hypothesis indicated that there was no significant relationship between the audit firm size and qualified audit report. According to the second and third hypotheses, there were significant positive and negative relationships between auditor's specialization in the partner level and audit firm with the qualified report, respectively. The fourth one regarding the relationship between the auditor's selection tenure and qualified audit report was rejected. The fifth hypothesis results also indicated that there was a significant negative relationship between audit fees and qualified audit report.</span>

<span lang="EN-GB">Reliability and efficacy of accruals and cash flows which are among the most important factors affecting dividend deviation have always been in question and subject to anomalies. The presence of these anomalies in accruals and cash flows and its effect on future returns and the consequences that they can have in country’s investments are the main motives to choose this issue for the current study. The statistical population includes all the accepted companies in Tehran Securities Exchange in the time domain of 2005 to 2012 that were studied after the systematic elimination of 153 companies from the original sample and 45 companies from the dividend continuity sample. The research is descriptive and correlational and the research assumptions are tested using statistical techniques. The results indicate that the first assumption based on rational pricing related to cash flows and total accruals in the companies in Tehran Securities Exchange is rejected in the study period; this indicates anomalies and regarding the significance of the coefficient related to the total accruals among the group of companies under study, the companies with low accruals have a higher abnormal return compared to companies with high accruals.</span>

Management is trying to maximize your rewards and that means in terms of net profit, return on investment (performance) or other accounting measures and also by trying to Making positive changes in the prices of corporate securities to be done. In other words, the maximum managers Their interests are trying to improve corporate performance and the improvement of the capital Investors will be aware of the attention and increased trade and thus share in research Willing to "review the independent non-executive directors' fees from the perspective of agency theory" discussed Is. The sample is composed of 92 companies selected by systematic elimination Is. The company had a total of 460 years. To analyze the data analysis and hypothesis testing This software has been used 7 EVIEWS according to regression analysis, the following results were obtained: Between independent non-executive director's fees and visible efforts there is a significant positive relationship manager. Between independent non-executive directors' fees and the number of board meetings there is a significant positive relationship.

Accounting standards, are rules governing how to do accounting work, and specify what information must be provided in financial reporting. The main objective of this study was to compare the stronger accounting standards against weaker accounting standards which in this study, we compare accounting standards of Iran and international standard in terms of Rents. The population of the research is institutions member of accounting community; that to collect theoretical principles of the study, library methods and to collect statistical information, questionnaires were used. Cronbach's alpha coefficient was used for validity and reliability of questionnaire, and to analyse the data, Student's t-test, Kolmogorov - Smirnov test and Friedman test was used. SPSS21software was used to analysis. Time limit of this research involves the second half of 2016. The population of the investigation includes audit firms of Certified Public Accountants community. Findings from analysis of statistical data are at 95% reliability level, which reject us hypothesizes based on non-reliability, unsuitability and lack of understanding. We conclude that Iran's accounting standards relative to international standards from the perspective of professional judgment of auditors to determine the rent type, in terms of degree of reliability, intelligibility, functionality is more appropriate.

The purpose of this study was to investigate the relationship between stock futures fall risk with non-transparent financial reporting at three levels of size, efficiency and return on equity, in the period 2010 to 2014 was in Tehran Stock Exchange. The population of the study are all companies listed in Tehran Stock Exchange. Data collected and calculated by using Excel software Eviews 7 been analysed and the conclusion was That the risk of future falls in the stock of non-transparent financial reporting for companies with low return on equity With high efficiency, equity, and efficiency in the large companies, there is a significant relationship

Due to the sublimation and perfection of human knowledge in economics, the concept of efficiency developed in the past two decades and the measurement of it, based on different theories and practice. In economics, efficiency means the maximum of possible output from a certain amount of input. The efficiency is very important for developing countries Because these countries face to a shortage of inputs, production factors and technologies. So the usage of existing resources is critical for these countries. This paper aims to evaluate and rank the financial performance of the chemical firms listed in Tehran stock exchange. We Use the data environment analysis and TOPSIS methods. This research includes one major question that which company performs better due to the financial ratios. The sample includes the firms in Tehran Stock Exchange within a 3-year period (2013-2015). The Results show that Ahvas Petrochemical company, Persian Gulf Petrochemical Industry company and Iran Chemical Industries company are more efficient than others.

The concept of value is of great importance for investors. The goal of different groups of investors is always to maximize the value of their capital. The aim of this research is developing factors effective on securities in capital market in order to develop a paradigm for fair valuation that leads investors to make better decisions. To study fair value in a precise and comprehensive way, effective variables are divided into three main categories. First: evaluation variables including cash flow (income quality), discount rate, and earnings per share; second: intra-organizational variables of corporate governance including the type of ownership (the number of institutional investors), management quality (the number of boards in charge or centralized management as well as the number of  non-in charge board of directors or decentralized management), the amount of reward, compensation and quality of organizational structure; third: variables relating to reporting quality such as offering reliable and on time information. Other variables such as firm size and operation cycle (complexity of business environment) have also been studied. And according to selected sample, methods and statistical analysis, a paradigm for fair valuation has been developed.