Compared with net earnings, the components of earnings are more informative in companies whose components have different qualities of persistence and volatility. We examine the issue of whether net earnings together with their components have more information content than only net earnings. We construct a model to describe the effect of components volatility and their persistence through disaggregation of earnings value relevance and predictability. The analyses in our study are based on 600 firm-year observations in Tehran Stock Exchange (TSE) for the period 2005-2019. Data are derived from RAHAVARD NOVIN Iranian software and firms' financial statements. The statistical tests for data analyses are the difference of means test (t-test) and regression analyses. The results of the current study indicate that as the persistence and volatility of selected components of earnings (sales, employee expenses, other selling, general and administrative expenses, and income taxes) increase, earnings disaggregation can improve earnings predictability. Furthermore, when the volatility of employee expenses increases, disaggregated earnings can improve earnings value relevance. As the value relevance of net earnings has been declined over the past decades, the results of the current study suggest that earnings disaggregation plays a major role in improving earnings value relevance and their predictability.

This study attempts to predict future stock returns by return on owners equity ratio (ROE) namely, earning to equity book value ratio and its variability both in company level and in portfolio level. Calculation of owners equity is based on Ohlsons (1989) model and clean surplus relation (CRS). The research of the statistical population includes 130 of companies listed in Tehran Stock Exchange during 1379 to 1384. The research results show that there is a significant relationship between ROE and future stock return. But, the explanatory power of the ROE is stronger and more significant in portfolio level than company level. Also, the results indicate existence of a significant relation between variability of the time series ROE of a stock and the future return of that stock.

Corporate responsibility reporting is associated to economical, ethical, social and environmental aspects of corporate activities. Therefore, whether shareholders consider corporate responsibility reporting’ s information in stock valuation is important. In this study, using the hassel et al. modified ohlson model, we investigate the role of corporate responsibility reporting on firm valuation by investors. Level of corporate responsibility reporting is measured using a model developed by Hassas Yeganeh & Barzegar. Results from 44 firms listed in Tehran Securities Exchange (205 firm-year observation) suggest that firm value is positively correlated with degree of social responsibility disclosure. Moreover, results suggest that financial information and CSR combined explains market valuations better than only financial information.

Objective: The value relevance of financial statements is of great significance to investors and standard setters. Comparability of accounting is one of the increasing features in the financial reporting system. It generally means that two reporting entities that face the same economic events use the same accounting methods to record underlying transactions. The present research examines whether the accounting comparability among industry peers enhances the value relevance of earnings and book value. This is an important question because both the Financial Accounting Standards Board and the Securities Exchange Commission seek greater comparability in financial reporting.Research Method: In order to study the subject based on the panel regression model, in the period 2010 to 2020, data of 111 companies listed on the Tehran Stock Exchange were collected and used to test research hypotheses.Results: The results show that accounting comparability increases the value relevance of earnings, but not book value. Financial statements that are more comparable do better in gaining the trust of users, which increases the value relevance of earnings per share. This means that when companies demonstrate the ability to compare more information than their industry counterparts, investors place a higher value on reported profits. However, the incremental benefits of accounting comparability are attenuated when financial reporting opacity is high or when there exists an internal control material weakness over financial reporting. In contrast, comparability benefits are enhanced when an industry specialist auditor is employed.

The main purpose this research is the effect of asset management on the relevance of accounting information Considering variables of financial statements in companies listed on the Stock Exchange. The main hypothesis of this study was evaluated by four models. In this study the value relevance of accounting information were measured Using Ohlson's Model (1995). Variables that likely affect on value relevance of accounting information are Asset management, firm size and financial leverage. Sample is 103 companies listed on the Tehran Stock Exchange and data were analyzed by using panel data. The results indicate that asset management increases Value relevance of accounting information in companies. Asset management, considering the company's size and financial leverage, improves the value relevance of accounting information in companies

Assumption governing the current literature of researches related to the information content of accounting variables is that market prices are good alternative for the stock value, the claim that according to a number of researchers may create wrong perceptions conclusion based on research related to value relevance. In fact, due to inefficiency in the market, it is possible that the impact of accounting information on stock price is not done immediately and without delay. In this case, measuring the relationship between the mentioned variables is not suitable, because market values have been adjusted yet due to the presentation of financial information and the association between information and market variables is considered irrelevant. In this study, the effect of market inefficiency on the estimation of coefficients in conventional models to assess the value relevance was evaluated analytically and empirically based on data from 100 companies in Tehran Stock Exchange during the years 2008 to 2015. It was found that market inefficiency has a negative impact on the value relevance of accounting information.

In recent years, intangible assets have received an increasing importance and considered as a valuable factor from the scientific communities and high-level executives. One of these assets is goodwill that its amortization in Iran is different from what included in international standards. The difference in amortization of these valuable assets which may also have value relevance, seems to be an important issue. Accordingly, this study examines the value relevance of goodwill amortization and effects of financial leverage on it, considering both international and Iranian standards. The research population included 70 firms listed in Tehran Stock Exchange during the period from 2008 to 2017. To test hypotheses, the multivariate linear regression using the pooled and panel data is applied. Results show that there is a significant negative relation between goodwill amortization according to Iranian standards as well as international standards and market capitalization. Moreover, findings indicate that goodwill amortization based on international standards has more power to explain stock market capitalization than goodwill amortization based on Iranian standards. Also, results show that financial leverage has a significant effect on the relation between goodwill amortization and stock market capitalization, according to both international and Iranian standards.