หน้าที่ 7 Characteristics of respon

หน้าที่ 7 Characteristics of respondents
Experience (years) Number of respondents Remarks
1~5 years 8
railway and sea transport
workers and experts
6~10 years 7
Over 10 years 7
Quantitative factors were taken from data of existing studies. To take
account of the uncertainty of the respondents’ personal opinions into the
qualitative factors, the survey employed the linguistic expression of
Aminand Razmi (2009) which was converted into the triangular fuzzy
numbers (TFNs). shows the conversion of seven linguistic
expressions, VL, L, ML, M, MH, H, and VH, into TFNs.

Linguistic expressions and the fuzzy numbers

shows TFNs corresponding to individual linguistic representations.
For example, if a factor is low, it can be converted into (0, 1, 3).
Linguistic variables
linguistic variables