TY - JOUR ID - eprints1640 EP - 23 AV - none TI - Ordinary Least Squares and Genetic Algorithms Optimization in Smoothing Transition Autoregressive (STAR) Models KW - Genetic Algorithms; MATLAB; Membership Functions; Smoothing Transition Autoregressive UR - http://www.svpublishers.co.uk/#/ijcis-mar-2011/4550826231 SN - 2229-5208 N2 - Abstract?In this paper we present, propose and examine additional membership functions as also we propose least squares with genetic algorithms optimization in order to find the optimum fuzzy membership functions parameters. More specifically, we present the tangent hyperbolic, Gaussian and Generalized bell functions. The reason we propose that is because Smoothing Transition Autoregressive (STAR) models follow fuzzy logic approach therefore more functions should be tested. Some numerical applications for S&P 500, FTSE 100 stock returns and for unemployment rate are presented and MATLAB routines are provided VL - 2 Y1 - 2011/03// IS - 3 JF - International Journal of Computer Information Systems A1 - Giovanis, Eleftherios PB - Silicon Valley Publishers SP - 17 ER -