The Rational of Cardinal Grey Relational Grade

The grey relational grade is one of the most important topics in grey system theory; the main function is to get the measure among the discrete sequences. Since 1982, the first grey relational grade was proposed by Professor Deng, till now, they have at least five kinds of cardinal grey relational grade are used. However, difference grey relational grade makes difference result. Hence, in this paper, we based on the four axioms in grey system theory to check the adaptive of difference grey relational grade, to find the ration of the answer from difference grey relational grade.