利用系统动力学和非线性经济计量方法，以各样本国数据资料进行模拟研究，建立理论模型。
Introducing systematic dynamics and nonlinear economic approaches, this paper establishes the theoretical model based on the simulation research on a vast amount of data.
提出了非线性计量经济建模变量选择的一种方法。
This paper describes a variable selection method of nonlinear econometric modeling.
本文选择农业意义明确的经济计量因子的非线性函数形式，采用最优化方法进行农业技术趋势项模拟。
A nonlinear function of economic factors of clear agricultural meaning is established and the tendency of advancement in agricultural technology is simulated by means of optimization.
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