“…there is an effort to eliminate redundant variables. Such an approach is known in the literature as the creation of the reduced form of the model, and represents the most common approach to the creation of the model that was used, for example, in the studies (Lin, Liang, Chen, 2011;Wang, Lee, 2008;Niemann et al, 2008;Tseng, Hu, 2010;Psillaki, Tsolas, Margaritis, 2009;Cheng, Chen, Fu, 2006).…”