Please insert Figure 1 about here
Figure 1. Hierarchical structure of factors
Experts estimate activities using triangular fuzzy numbers and the following values of the fuzzified Saaty’s scale: identical (1,1,1), equally significant (1,1,3), more significant (1,3,5), much more significant (3,5,7), markedly more significant (5,7,9); dominant (7,9,9). The factors are compared in groups, and pairwise comparison matrices are formed.
The weights of individual experts are defined by gamma coefficient.35 Based on the experience of an individual expert in the analysis of activity in the operating rooms (denoted by bk ), and experience in the analysis of activities in operating rooms adapted to certain types of operations (denoted by ck ), the value ofγk is determined. The scale for describing experience is 1 to 5. Based on Eq. (5),35 a weight vector of experiment Γ is obtained:Γ={ 0.09,0.13,0.09,0.19,0.13,0.13, 0.09,0.06,0.06,0.04} .
On the basis of row geometric mean method (RGMM), aggregated matrices are determined. The consistency of individual expert comparison is verified using consistency index (CI), while the consistency of group decision-making is determined by centric consistency index (CCI).37 Defuzzification is obtained using the mean aggregated weight method.
The aggregated matrix based on the comparison of criteria groups in relation to the goal is presented in Table 2.
Table 2. The aggregated matrix for groups of factors