“…So far, the authors of the present paper have investigated several methods to construct regression models: evolutionary fuzzy systems, neural networks, decision trees, and statistical algorithms using MATLAB, KEEL, and WEKA data mining systems (Graczyk et al, 2009;Krzystanek et al, 2009;Król et al, 2008;Lasota et al, 2010), on the basis of a real-world case of real estate appraisals.…”