他开发了一个模型，将把废旧产品的回收考虑在内，比较了回收内核的预测价值和实际价值。
A model was developed that would take outdated returns into consideration and compare the forecast for usage versus actual usage of returned cores.
许多论文还注重研究简易回收的定性模型，并提供回收率的预测方法。
Many papers also focused on qualitative models with simple returns and provided forecasting for the rates of return.
回收的模型被用于预测白杨圆木的价值。
Regression models are presented for predicting the value of aspen logs.
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