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Time-stamped data for transportation and logistics are essential for estimating times on transportation legs and times between successive stages in logistic processes. Often these data are subject to recording errors and omissions. Matches must then be inferred from the time stamps alone because identifying keys are unavailable, suppressed to preserve confidentiality, or ambiguous because of missing observations. We present an integer programming (IP) model developed for matching successive events in such situations and illustrate its application in three problem settings involving (a) airline operations at an airport, (b) taxi service between an airport and a train station, and (c) taxi services from an airport. With data from the third setting (where a matching key was available), we illustrate the robustness of estimates for median and mean times between events under different random rates for “failure to record”, different screening criteria for outliers, and different target times used in the IP objective. The IP model proves to be a tractable and informative tool for data matching and data cleaning, with a wide range of potential applications. 相似文献
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选取了某商用车公司的部分销售数据,在SQL Server 2008中对数据进行了预处理,利用经典的K-means算法对其进行了聚类分析,按客户购买车的种类和地区进行细分,细分结果对于该公司制定有针对性的销售方案有着一定的参考价值。 相似文献
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面对2015年4000万辆的计划产能,我国汽车行业可能出现严重的产能过剩。本文采用SPSS曲线估计的方法对19952012年的销量数据进行拟合,经过综合评价选择二次方程对2015年的汽车销量进行预测,得出确实存在产能过剩危机的结论。最后提出缩减预期销量与计划产能差距,提高汽车产业竞争力的若干对策。 相似文献
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As a response to growing concerns regarding the call for clean energy and its impact on future automobile sales, this study uses a classical factor model and the Peña-Box model to examine the contemporary and time-varying relationships of different brands/models of cars in Taiwan between 2003 and 2007. In this paper, we demonstrate the complementary characteristics of these two analytical and forecasting methods. The results confirm that these two models can derive equally important but different information from the same time series data. Furthermore, the models are a useful marketing tool for discovering the current preferences of car purchasers, as well as their preference changes over time. 相似文献
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从2012年一季度我国轿车产销量的变化趋势,分析各生产厂家和分排量及分国别的轿车产销情况。指出:2012年一季度我国轿车产销量出现了近年来少有的负增长,预计从二季度开始产销量增幅将由负转正。并预测:2012年我国轿车产销量还将保持增长态势,但增速可能在10%以内,自主品牌轿车的产销量可能出现负增长。 相似文献
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针对非独立成套公房难以出售问题,提出竞价出售、就地改善、引进外资改造等方法。为加快公房出售的速度,还需采取公房逐步提租、规范物业管理收费行为、加大贷款力度和延长还款期限等措施。 相似文献
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根据管理经济学关于需求价格弹性的概念,商用车作为一种商品有其自身的需求价格弹性,并且不同车型、不同用途、不同用户会对需求价格弹性有直接的影响。因此研究不同车型、用途的商用车产品的需求价格弹性对东风商用车公司在商品规划、开发、定价、收益确定及销售市场上判断自己的价格策略和技术成本策略具有重要意义。 相似文献
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文章以4S店客户信息数据库作为研究对象,利用数据挖掘中关联规则挖掘算法Apriori,挖掘出已成交的客户特征和规则,对分类结果进行分析,并在某品牌4S店销售汽车过程中借鉴这些规则,有针对性的地进行引导销售,从而提高了销售成功率。 相似文献
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对伊嘉公路五汤段编制竣工资料过程中需要重视的问题,资料的编制内容,编制要求和管理方法,竣工资料整理编制中的注意事项和编制体会进行了全面详实的阐述。 相似文献
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