王继顺,王传斌(连云港师范高等专科学校,江苏连云港222006)WANG Ji-shun,WANG Chuan-bin(Lianyungang Teacher's College,Lianyungang 222006,China)
连云港港口货物吞吐量自适应过滤预测模型及其Excel宏实现
Self-adaptive Filter Prediction M odel of Lianyungang Port Throughput and Realization w ith Excel Macro
王继顺,王传斌(连云港师范高等专科学校,江苏连云港222006)
WANG Ji-shun,WANG Chuan-bin(Lianyungang Teacher's College,Lianyungang 222006,China)
利用自适应过滤预测法对连云港港口2008年前几个月货物吞吐量数据建立港口吞吐量预测模型,通过VBA编程实现Excel的宏按钮操作,按照预测误差方差最小原则交互实现迭代功能,选择对最小预测误差方差贡献最小的一期对应的权值作为最佳权值进行预测,获得了精确度较高的预测结果。
港口货物吞吐量;自适应过滤法;预测模型;Excel宏;VBA编程
Abstract:By analyzing the modeling process of the self-adaptive filter prediction,the self-adaptive filter prediction model is introduced to predict the port throughput based on the data of Lianyungang port throughput from several earlier months in 2008.Programs are realized to the iterative function alternately according to the principle of the smallest variance of forecast error using excel macro and VBA codes.In the iterative procedure the weights are chose to take the best weight corresponding to a smallest issue among the smallest variance of forecast error will carry on the forecast,which results show that the method can effectively solve the port throughput prediction problem.
Key words:port throughput of goods;self-adaptive filter method;prediction model;Excel macro;VBA code
Self-adaptive Filter Prediction M odel of Lianyungang Port Throughput and Realization w ith Excel Macro
以连云港为龙头的江苏沿海地区发展规划获得国务院批准以来,港城发展跃上国家战略平台。连云港从上到下正积极放大政策效应,组织动员全市结合实际,扎实推进规划实施。其中积极扶持连云港港口开展对外贸易,港口建设步伐越来越快。港口建设必须在科学的港口规划指导下进行,而港口规划的制定离不开对港口吞吐量的合理预测。港口货物吞吐量预测是港口总体规划的重要研究内容之一,预测结果的合理性和准确性对于港口的总体布局、建设规模以及集疏运等配套设施的建设具有重要的指导意义。
港口货物吞吐量是一个复杂变量,受到多方面因素的综合影响,各因素间存在着许多无法确定的变量和关系,在进行港口货物吞吐量预测时,一般采用时间序列预测、回归分析预测[1]、趋势法预测、分块组合预测[2-5]、线性灰色预测[6-7]等。……