Journal of Modern Agriculture July 2013, Volume 2, Issue 3, PP.42-52
Minimax Curve Fitting Method in Application of C-D Production Function ——With
the Grain Yield Data in China as the Example
Lemin Gu Tongji University, Shanghai,China gulemin@tongji.edu.cn
Abstract In the article, Minimax method of curve fitting under the principle of Chebyshev optimal approximation has been introduced; and C-D mathematical model under the principle of Cobb-Dauglas production function model is described. From the data processing perspective, five major factors that affect the grain products: (1) Consumption of chemical fertilizer; (2) Total sown area; (3) Areas affected; (4) Total agricultural machinery power; (5) the relationship between the total employed persons of primary industry and domestic grain products, carry on the fitting under the optimal approximation principle to the C-D mathematical model, and process the data above during the years of 1983-2011 in China. This new combination of optimal approximation result shows that the maximum absolute error of the description during 29 years on our country grain products does not surpass 986 ten thousand tons, and the maximum relative error of which is less than 2.1%. In this foundation, the explanation and the analysis of the data has been explained. Data analysis showed that Maximum error minimization can explain "the maximum risk minimization principle", as well constitutes the greatest possible range of grain security; and during 29 years from 1983 to 2011, China's grain yield growth mainly depends on the Consumption of chemical fertilizer and the Total Agricultural Machinery Power, where the Consumption of chemical fertilizer has a "positive" effects, while the Total Agricultural Machinery Power tends to dynamically saturated and belongs to theoretically "negative " i and does not constitute actual negative effects; in addition, the Total sown area is the largest of the "positive" effects, and the grain yield still may grow under the condition of the Total sown area does not increase, but the increase in the grain sown area will promote our country's grain yield rapidly; the Areas affected is "negative" impact factors of grain growth, whose absolute value is increased but the relative value in reduction. Along with the development of agriculture modernization , the Total employed persons of primary industry for grain growth influence has changed from "positive" to "negative" with limited influential degree, demonstrating its potential for development and improvement. Keywords: Chebyshev; Optimal Approximation; C-D Production Function; Curve Fitting; Grain Products; Risk
极小极大曲线拟合法在 C-D 生产函数中的应用 ——以粮食产量数据为例 顾乐民• 同济大学,上海 201804 摘
要:介绍了基于切比雪夫最佳逼近原理下的极小极大曲线拟合法,描述了基于 C-D 生产函数模型原理下的 C-D 数学模
型,从数据处理的角度出发,对影响粮食产量的 5 个主要因素:(1)化肥施用量;(2)粮食播种面积;(3)成灾面积; (4)农业机械总动力;(5)第一产业就业人数与我国粮食产量建立联系,在极小极大逼近原理下对 C-D 数学模型进行 中图分类号:F30,文献标识码:A - 42 www.jma-journal.org