Exploring the Impact of Delivery Performance on Customer Transaction Volume and Unit Price: Evidence from an Assembly Manufacturing Supply Chain

This study examines the effect of delivery performance on customer transactions. We propose that different delivery performance dimensions (on‐time delivery rate, early delivery inaccuracy, late delivery inaccuracy, and delivery speed) have varying impacts on future customer transaction quantities and unit prices. We further explore the effect of customer types on the proposed relationships. Trade customers (resellers) and Original Equipment Manufacturer (OEM) customers generally have different operational needs for deliveries and therefore may value these metrics differently. Using instrumental variable regression, we analyze a proprietary transaction‐level dataset. The information was compiled by a Fortune 500 manufacturer from its Heating, Ventilation and Air Conditioning (HVAC) control product supply chain, consisting of the manufacturer and its customers. The results indicate that measures of delivery performance affect customer transaction quantity and unit price differently. Furthermore, these impacts can differ significantly between trade customers and OEM customers. These findings provide fine‐grained insights about tuning delivery capabilities to increase sales volume or boost price.     

实变函数与复变函数之比较

本文主要从三个方面阐述了一元实变函数与单变量复变函数间的重大差异,由此巩固和理解基础课与后继课间的内在联系,达到事半功倍的效果。     

从语篇变量看高考英语阅读测试的效度

阅读是最为重要的一项语言能力。在我国,阅读一直是中学英语教学的重点,在高考英语测试中也是最重要的部分之一。从语篇变量的角度建立了一套高考英语阅读测试的效度验证标准,并用该标准对2009年高考英语重庆卷阅读测试部分进行效度检验。结果表明,高考英语重庆卷阅读测试符合考试大纲和教学大纲的要求,设计科学、合理,知识覆盖全面,考查重点突出,具有较高的内容效度,但同时也存在一些不足。最后,为阅读教学和测试提出了相应的建议。     

用模糊控制和变频调速实现恒压供水

为实现水泵运行节能和有消防保障的恒压供水,分析了水泵调速系统原理。以单片机模糊控制器、变频器和3台主泵为核心,设计出供水控制系统结构,同时介绍了调试中的关键经验。该系统节能效果明显,设计思路和接口技术可为同类供水系统的技改提供借鉴。     

变系数齐线性方程稳定的必要条件

用等价变换和解的性质得到了变系数齐线性方程稳定的一些必要条件．     

水稻种植户生产性资金投入行为及其影响因素——以黑龙江佳木斯地区为例

采用对黑龙江佳木斯市桦南县和桦川县305户农户2009年全年水稻种植投入产出的调查数据,实证分析了水稻种植户生产性资金投入行为及其影响因素。运用Logit模型对固定生产投资可能性的影响因素进行了计量检验,结果表明:家庭规模、非农就业比例、家庭平均教育水平、耕地面积、家庭经营收入、信贷水平、农户对稻米最低收购价格期望度对固定生产性投资有显著影响;是否发生灾害对农户生产性投资规模无显著影响。运用Tobit模型对生产性资金投入规模的影响因素进行了计量检验,结果表明:家庭规模、非农就业比例、家庭平均教育水平、耕地面积、家庭经营收入、信贷水平和家庭住房价值、农户对稻米最低收购价格期望度、是否发生灾害对农户生产性投资规模有显著影响。在模型检验结果的基础上,提出促进水稻种植户增加固定生产性投资和增加生产性资金投入的合理建议:提高稻米最低收购价格;提高水稻种植的规模化程度;努力提高水稻种植户的教育水平;确保水稻种植户能够及时获得生产性资金贷款。     

Representing degree distributions, clustering, and homophily in social networks with latent cluster random effects models

Social network data often involve transitivity, homophily on observed attributes, community structure, and heterogeneity of actor degrees. We propose a latent cluster random effects model to represent all of these features, and we develop Bayesian inference for it. The model is applicable to both binary and non-binary network data. We illustrate the model using two real datasets: liking between monks and coreaderships between Slovenian publications. We also apply it to two simulated network datasets with very different network structure but the same highly skewed degree sequence generated from a preferential attachment process. One has transitivity and community structure while the other does not. Models based solely on degree distributions, such as scale-free, preferential attachment and power-law models, cannot distinguish between these very different situations, but the latent cluster random effects model does.     

日本对华直接投资与中日贸易增长的变化分析

本文采用格兰杰的两变量模型,根据Engle-Granger的协整检验,误差修正模型以及Granger非因果检验等方法,通过加入虚拟变量分析后结果表明,日本对华与日本对华FDI输出表现出显著的协整关系,同时误差修正模型也反映了短期修正的变化;Granger非因果检验表明,日本对华输出和输入是日本对华FDI的单向Granger原因。