An investigation of the smoothing of financial Ratios by management and the effect on decision users

The study investigates the smoothing of financial ratios by management and the effects of financial in formation in accepted companies population in tehran securities exchange. In the study using deductive, inductive approach, firstly with expressing theoritical concepts and first model going toward details of study (Financial statement) ends to inductive result and statistic tests. It is disscused two hypothesis in the study, according to theorical bases: which the first one investigates existence financial ratio smoothing and the second one smoothing Analysis of variance (ANOVA) statistics method is used. For testing the first method panel data multiple regression is used For testing second hypothesies. Testing the first hypotesies indecated that financial ratios smoothing behavior in 5% significant level for some under the study years (76-81) observed for the most of the investigated. Financial ratios the second hypothesis indicated that the mentioned factors on smoothing index of some investigeted financial ratios were efficacious. Among these effective factors the most power Full Factors on financial ratios smoothing index has been Agency debt, and the most weak factor has been the size of company.