Improving Non-equidistance GM(1,1) Model’s Grey Differential Equation

： Mei Fan and Yong Wei
： Unequal interval， Indicator function， Grey differential equation， Accumulation method

： Through analyzing the non-equidistant GM(1,1)models modeling mechanism, by using the Lagrangemean value theorem, the paper find it equal derivative.And get the white differential equation distributed inthe mathematics model. Hence, we can get a new greydifferential equation, and could match the whitedifferential equation. Based on the analysis of indicatorfunction, the parameters a and b can get in the first,then use the twice accumulation method to getparameter c. By the realistic examples, the result isproved to be precise and reliable.

Journal of Grey System(Volume 16)
： 051~054
： 2013