In this study, the factors affecting the capital structures of companies with the need for examining the relationship between stock returns of companies and investors wishing to invest in financial instruments in predicting the possibility of finding and assessment options that could achieve the intended results. For this purpose, the ISE-100 index of industrial companies within the capital structure of the balance sheet and income statement items related to the financial ratios obtained from the relationship between the rates of return on equity ANFIS (Adaptive Neuro-Fuzzy Inference System) is explained by examining the method.
ISE 100 index from 2003-2007 in the industrial companies operating in the balance sheet and income statement bulunarak explained the 40 units the company has been involved in research. These companies, 14 input variables and 1 output variable was the subject of research. Return on Equity Ratio as a result of all tests made to estimate using the ANFIS model, were significant enough to use 4 input variable.