Results (
Thai) 1:
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Quantitative factors were taken from data of existing studies. To takeaccount of the uncertainty of the respondents’ personal opinions into thequalitative factors, the survey employed the linguistic expression ofAminand Razmi (2009) which was converted into the triangular fuzzynumbers (TFNs). shows the conversion of seven linguisticexpressions, VL, L, ML, M, MH, H, and VH, into TFNs. shows TFNs corresponding to individual linguistic representations.For example, if a factor is low, it can be converted into (0, 1, 3).Based on the answers from respondents and , the linguisticvariables of the qualitative factors are converted into TFNs, which weredefuzzifiedto single numbers using the following Equation (1).
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