In the AHP Method, the elements of each level are pair wisely compared with the corresponding elements in the higher levels to calculate their relative importance using a nine-point scoring scale presented by Salty in 1980 (Table 1). Afterwards, the final weight so-called absolute weight will be calculated by integrating the relative weights. The adverse condition should strictly be observed while weighing criteria. As such, if the preference of the element ‘‘A’’ to the element ‘‘B’’ is equal to N, then the preference of the element ‘‘B’’ to ‘‘A’’ must be as 1/N. Moreover, the elements ‘‘A’’ and ‘‘B’’ should be homogeneous and comparable and the preference of the element ‘‘B’’ to ‘‘A’’ could not be zero or infinite. Every element of the hierarchy should be dependent upon the corresponding superior level. As is evident, in case of any changes in the structure of the hierarchy, the process should be re-evaluated. Table 2 gives the absolute weight of the main criteria. In this step, the pairwise comparison method was used to weight the criteria. It should be noted that the preference of each element on its own is one. Therefore, all the elements on the diagonal of the matrix are equal to 1.
In the AHP Method, the elements of each level are pair wisely compared with the corresponding elements in the higher levels to calculate their relative importance using a nine-point scoring scale presented by Salty in 1980 (Table 1). Afterwards, the final weight so-called absolute weight will be calculated by integrating the relative weights. The adverse condition should strictly be observed while weighing criteria. As such, if the preference of the element ‘‘A’’ to the element ‘‘B’’ is equal to N, then the preference of the element ‘‘B’’ to ‘‘A’’ must be as 1/N. Moreover, the elements ‘‘A’’ and ‘‘B’’ should be homogeneous and comparable and the preference of the element ‘‘B’’ to ‘‘A’’ could not be zero or infinite. Every element of the hierarchy should be dependent upon the corresponding superior level. As is evident, in case of any changes in the structure of the hierarchy, the process should be re-evaluated. Table 2 gives the absolute weight of the main criteria. In this step, the pairwise comparison method was used to weight the criteria. It should be noted that the preference of each element on its own is one. Therefore, all the elements on the diagonal of the matrix are equal to 1.
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