Investigation of the changes in the value relevance of accounting information and indentifying the factors which can affect the value relevance

Financial accounting users need accounting information for decision making purposes and when accounting information can be useful that has value relevance. The aim is investigation changing of accounting information´s value relevance and the factors which can affect it. We investigated the accounting information´s value relevance of 2،970 observations with using 4 models and OLS method during 18 years (1375-1392) and also for identifying the factors we use 100 samples of companies listed in Tehran Stock Exchange during 10 years (1383-1392). We find that after using the first accounting standards the value relevance of balance sheet relation is increasing. In addition we find that there is meaningful and negative relationship between changes in the value relevance of accounting information and company´s size، meaningful and positive relationship between changes in the value relevance of accounting information and company´s growth and also meaningful and negative relationship between changes in the value relevance of accounting information and company´s debt.