This paper presents an empirical investigation to study the effects of quality of earnings forecasts in predicting stock returns on 121 selected firms traded on Tehran Stock Exchange over the period 2009-2013. The study investigates the effects of three year means of earnings forecast accuracy on investors’ investment decisions in terms of volume and time horizon, i.e. short term and long term investment sentiment. Using some regression analysis, the study has determined a positive and meaningful relationship between the quality of earnings forecast and investment time horizon. However, the study did not find any meaningful relationship between earnings forecast accuracy and volume of investment.

This paper presents an empirical investigation to detect important factors influencing earning adjustment on firms selected on Tehran Stock Exchange over the period 2006-2011. There are four independent variables associated with the proposed study of this paper including Proportion of shares owned by institutional investors, Return on assets, Profit change and Market value to book value. In addition, Investment restructuring is considered as control variable. The results of the implementation of regression analysis indicate that there was a reverse relationship between earning forecasted adjustment and two independent variables including size of firm as well as the ratio of market value to book value. However, Net profit has a direct and positive relationship with earning forecast adjustment.