Rostami (2004) investigated the relationship between financial ratios of listed companies on the Stock Exchange stock returns paid rate. The results indicate that the two levels of firms and industries separately accepted by monitoring the financial ratios used in the rate of return on equity is a meaningful relationship.
Miri and Abrahimi (2011) examined the relationship between linear and nonlinear relationships Mai and non-metallic minerals industry stock prices in Tehran Stock Exchange for the years 2003 to 2009 were reviewed. Their results showed that the linear and nonlinear relationships between financial ratios and stock prices, there is no model in explaining stock prices have a greater ability to intercept to explain Competent.