An Approach to Grey Modeling Based on cot(x~α) Transformation

This paper introduce the method of trigonometric-power function transformation against the modeling standardized data is put forward.It has been proved the oretically that the smooth degree of data sequence can be greatly enhanced by this function method, which turns out to be more effective than logarithmic function method and power function method.So the method can widen the range of application of grey modeling.Example verification indicates the practical result shows the effectiveness of the proposed approach.