This paper suggests Gray combined Model should be used in estimating the Engine Development Cost so as to solve the problem mentioned above.
为解决这一问题，研究了灰色组合模型在发动机研制费用估算中的应用。
The space of prediction and application of non-stationary time series were expanded through the combined model of wavelet analysis, gray and time series prediction methods.
将小波分析理论、灰色预测理论和时间序列预测法组合进行需水量的预测，为原始非平稳时间序列的预测应用拓展了空间。
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