Comparison of the COG Defuzzification Technique and Its Variations to the GPA Index
This work addresses the evaluation of fuzzy assessment models for potential users in education or decision-making, but it is incremental as it focuses on comparing existing methods.
The paper compared the outcomes of the Center of Gravity (COG) defuzzification technique and its variations (RFAM, GRFAM, TFAM, TpFAM) as assessment models against the traditional Grade Point Average (GPA) Index, with examples provided to illustrate the results.
The Center of Gravity (COG) method is one of the most popular defuzzification techniques of fuzzy mathematics. In earlier works the COG technique was properly adapted to be used as an assessment model (RFAM)and several variations of it (GRFAM, TFAM and TpFAM)were also constructed for the same purpose. In this paper the outcomes of all these models are compared to the corresponding outcomes of a traditional assessment method of the bi-valued logic, the Grade Point Average (GPA) Index. Examples are also presented illustrating our results.