The environmental and economic factors affecting the space component and the time coefficient are sieved by stepwise regression, and factor structure models are established.
用逐步回归方法筛选影响空间分量和时间系数的环境和经济因子，组建因子结构模型。
To resolve the problem in the application of the models, the author expanded the classical factor set of models by introducing the concept of integral regression.
为解决模型实际应用中的问题，笔者引用了积分回归的概念，对传统模型的因子集进行了扩充。
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