Through discussing the factors that affect the electricity demand and setting up the calculating economical model to analyze and forecast the increase of the electricity demand.
分析影响电力需求的主要经济因素，建立计量经济模型，对分析和预测电力需求的增长具有现实的意义。
The sixth part forecasts the future logistics demand of Shandong Province on the basis of one linear regression, polynomial regression, gray system G(1,1) model and combination forecast model.
第六部分采用一元线性回归、多项式回归、灰色系统G（1，1）模型和组合预测模型对山东省现代物流业未来需求状况进行了中期预测。
Also we can forecast the air spares demand by the order model, and use the air supply ratio land the capital ratio to evaluate the service quality of air supply system.
本文的特点在于利用数学方法来预测航材的需求，运用航材保障率和资金周转率来评价航材保障系统的服务质量。
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