Grey incidence analysis of the factors which are linear correlative

Degree of Grey incidence is the parameter to describe the relationship between the factors. Many researchers have researched it and created several degree of grey incidence models. The simplest relation between the factors is linear correlation, so degree of grey incidence should measure linear correlation. This article calculates the degree of grey incidences by different models when the factors are linear correlative. And it is found that degree of grey incidence can not describe linear correlation very well. The result will be more accurate when the original sequences are dealt with by some operators before calculating. Distance and slope should be taken into account when create a new Grey Incidence Model.