An evaluation of survey by fuzzy linguistics based on the signed distance method

An evaluation of survey by fuzzy linguistics has been conducted using both the signed distance and centroid method. As to both methods, the proposed approaches, different from conventional survey algorithms via questionnaire rating item by linguistic variables, possessing the vague nature, we employed fuzzy sense of sampling to express the degree of interviewee's feelings based on his own concept, the result will be closer to interviewee's real thought. In this study, we re-model the previous method and use the signed distance method which would be effective and reliable to do aggregated assessment analysis.