Study on the morbidity problem in grey model

Whether the model we have built has the morbidity problem is a key condition to judge its practicability.So this paper discusses if the morbidity problem will appear in the process of parameters differentiate in grey model,basing on the condition number of matrix.Results show that the morbidity problem could only exist in GM(1,1)when the first item of original sequence is unequal to zero while other items are equal to zero approximatively.Accordingly,there's no practical meaning to predict by this kind of sequence.Consequently,it also proves that the morbidity problem doesn't exist in GM(1,1) when making a grey prediction.