In this study the ability of accounting earnings in predicting and explaining the stock returns of the firms in Tehran Stock Exchange has been investigated. This research aims to determine whether the number of accounting earning has considerable role in predicting and explaining the stock returns and revealing capital market response to information, after controlling risk and discount rate indicators. Thus 41 companies have been selected in the years 1375 to 1389. Selected data for analysis are of time series type. The selected OPERATING INCOME and returns have been aggregated through the ratio of individual corporation's market values on total sample market values, and the regression analysis has been used for testing the hypotheses. Results indicate that current OPERATING book INCOME to equity ratio is positive predictors of future returns. Moreover, changes in OPERATING INCOME have the ability in explaning returns around earning's changes announcement.

In this study, information content of OPERATING INCOME and cash flow OPERATING and the effect of information asymmetry on information content of these variables to predict stock return in the 70 companies accepted on Tehran Stock Exchange in the period of 1385 to 1389 and use of linear multiple regressions was studied. Results showed that OPERATING INCOME and cash flow OPERATING has information content and can explain stock return, and the information content of OPERATING INCOME is more than cash flow OPERATING. Also, the information asymmetry effect the information content of OPERATING INCOME and cash flow OPERATING and with increasing information asymmetry, information content of cash flow OPERATING is increasing.

This paper studies the relation between earning volatility of firms and the future OPERATING INCOME predictability to define the effect of OPERATING INCOME volatility on investors’ expectations concerning future INCOMEs. In other words, is there any possibility to predict future INCOME using current volatility INCOMEs? Logically it seems the present trend of companies will continue in future.For this purpose we considered the data of 120 companies which were admitted in Tehran Security Exchange Organization between 2003-2008. The examination was made based on regression analysis.The results indicate the meaningful and reverse relation between current volatility INCOMEs and future OPERATING INCOME predictability. It also signifies that OPERATING INCOME predictability will increase In consequence of deducting accrual items from OPERATING profits.

Background: Hospitals are dealing with unlimited demands and limited resources. Hospital managers should use appropriate strategies to improve quality of services، enhance patients’ satisfaction and increase financial resources. This study aimed to examine the impact of quality management. Methods: A participatory action research was used for the intervention on INCOME of OPERATING theatre in Vali-e-Asr Hospital in Tehran University of Medical Sciences، between March and September 2014. A quality improvement team was established and improved operational processes of the OPERATING theatre department of the hospital using Mosadeghrad’ s ten-step quality management model. The quality improvement team standardized processes، identified goals for the processes and improved them until achieved the goals. Accordingly، an action plan was developed and implemented for increasing the INCOME of the OPERATING theatre department. INCOME data of the OPERATING theatre department were obtained for a 6-month period in 2014، and were compared with a control 6-month period in 2013. Results: Implementing quality management increased the number of surgeries by 14. 96 percent، decreased cancelled surgeries by 14. 6 percent and reduced bill deductions imposed by health insurance companies by 44. 9 percent. As a result، the operation theatre department INCOME has increased by 68. 8 percent (P=0. 028). Some of solutions used for increasing the INCOME were as standardizing and improving working processes، removing unnecessary activities، empowering staff; increasing department’ s working hours، on time visit of patients by doctors and surgeons، reducing surgery cancellations، increasing number of patients، reducing deductions applied by the health insurance companies and training staff and patients. Conclusion: Implementing an appropriate quality management model appropriately helps improve quality of services and enhance hospital departments’ INCOME.

This paper investigates INCOME smoothing through the asset sales. We tested INCOME smoothing in the level of OPERATING INCOME.The test based on a linear multi-regression analysis for the companies listed in Tehran Exchange during 1381-1385. Investigation supports INCOME smoothing so that managers use the gains and losses of the asset sales to smooth earnings. Our evidence also indicate that the level of smoothing in the companies that experience lower level of OPERATING INCOME is more than those which experiencing higher level of OPERATING INCOME.

In this study; according to the role of accounting earnings and cash flow from operations as the base of decision-making and prediction, we examine the value relevance and information contents of accounting earnings and its components in the Tehran stock exchange. This is done by testing relationship between stock returns and accounting earnings and its components including: OPERATING INCOME, INCOME before taxes, net INCOME, accruals and cash flow from operation. The examine of hypothesis is done with the usage of pooled data related to the 331 selected companies among the accepted companies of Tehran stock exchange from 1380 to 1386.To calculate the stock returns changes, also independent and dependent variables, Excel program has been used. For statistical tests, values of coefficients and obtain the necessary statistical analysis used Pearson's correlation coefficients, simple and multiple linear regression, T, F, DW, and Wald statistics. Results show that OPERATING INCOME, INCOME before taxes and net INCOME have explanatory power of stock returns and are value relevant. Net INCOME has the highest power of explaining returns than the other variables and explains about 37% of changes of stock returns. Furthermore, results indicate cash flow from operations and accruals are not value relevant. On the other hand OPERATING INCOME, INCOME before taxes, cash flow from operations and accruals do not have incremental information content beyond net INCOME.

While some of the modern performance measures used in accounting rely on cash flow, others try to take advantage of the information content of net INCOME. However, whether the additional information content in the accrual components of earnings improves the internal performance measurement is an open empirical question. Conceptual framework of this paper based on agency costs and political costs. So that, firm size and information environment are tow important factors in value relevance of net INCOME and OPERATING cash flow. The main purpose of this study is to investigate interactive effect of firm size and information environment on value relevance of net INCOME and OPERATING cash flow. The sample of this study is selected from companies listed in Tehran Stock Exchange (TSE). The study period is between the years 2008 to 2013. The sample consists of 100 companies. To test the research hypotheses regression models using pooled data are incorporated. The results show that net INCOME has more additional and incremental information content than OPERATING cash flow to explain performance of stock market; but firm size and information environment have no effect on value relevance of net INCOME and OPERATING cash flow. According to the results, we find that, there are not interactive effect of firm size and information environment on value relevance of net INCOME and OPERATING cash flow.

The economic growth depends on the investment amount in each country. Establishment of big companies looking for gathering people's saving and conducting them to manufacturing goals will result in economical growth, increase the national impure production, job provision, increase the individual salary and finally public welfare. Risk and return of companies are affected by different factors such as OPERATING Cash Flow and net INCOME. These may impact on companies' performance and result in some changes in return of their stocks. This research focuses on impact of OPERATING cash flow and net INCOME on stock returns of automobile manufacturing companies listed in Tehran Stock Exchange (TSE). In this research, the relation between two above-mentioned factors is investigated for 27 listed companies in TSE that has been working there consistently in time period of 2004-2008. For This purpose panel data is used to investigate the relation between stock return and OPERATING Cash Flow and net INCOME. The results show the positive relation between stock return and net INCOME.

Earnings quality is a topic that especially after recent financial scandals has been considered. In addition, the issue of raising equity capital from stockholders' receivables has become an important issue in TSE. In this research first, we examine the earnings quality of listed firms of TSE in the period of 1378 to 1383. Then we will test the relationship between earnings quality and raising equity capital from stockholders' receivables in the mentioned period. In this paper we have defined earnings quality as the difference between OPERATING cash flows and OPERATING INCOME in long run. Although the results confirm the low quality of earnings in listed firms of TSE, but they show no relationship between earnings quality and raising equity capital from stockholders' receivables.