Correction to: Interpreting Linear Beta Coefficients Alongside Feature Importances in Machine Learning

Atlantic Economic Journal -     

电力营销线损精益化管理策略分析

伴随着我国人民生活水平的不断改善,生活中和工作中的电能需求也在不断增加.但是在电力营销的过程中,线损问题一直都是困扰电力企业的一大问题.在线损问题的导向下,造成了大量的电能损耗,也造成了电力企业的额外成本支出,影响了电力企业的经济效益,也影响了电力事业的健康发展.对此,就需要进一步做好线损问题的精细化管理,切实提高电力企业电力营销的综合效益.因此,本文立足问题,提出几点建议,以备后续参考.     

Income inequality among minority farmers in China: Does social capital have a role?

We used recently available household panel data collected by China's National Bureau of Statistics to examine the effects of natural, human, material, and social capital on income inequality among minority farmers in China's Xinjiang Province between 2011 and 2012. Results obtained from panel quantile regression and correlated random effects’ models show that income inequality and the poverty of ethnic farmers have been decreasing to some extent. Results also indicated that human capital exacerbates income inequality among the minorities, whereas the effect of natural capital on income inequality is not evident. Social and material capital reduce income inequality among ethnic minorities. Results from the decomposition of the Gini coefficient indicate that material and social capital contribute to a substantial majority of the income inequality in the region.     

技术竞争对企业专利许可行为的影响

知识经济时代，知识产权的重要性愈加凸显。基于海量的中国企业专利许可数据，就多种竞争情境对企业对外许可行为的影响进行研究。实证分析发现，随着竞争密度增大，技术市场扩张厚度增加，企业倾向于对外许可其技术，但技术提供数量与专利许可率之间存在倒U型关系，中国仍远未达到拐点；许可过程中科研实力起到决定性作用，实力较强的竞争者对许可行为具有显著的抑制作用，反之，则具有促进作用。当被许可人是同行竞争者时，并没有拒绝或者延迟对外许可。另外，在对外许可中，国有企业的竞争反应较弱，私营企业较敏感。最后，结合中国市场情况提出相应对策建议。     

"双循环"新发展格局下对消费金融公司发展的分析

我国国民经济经过多年高速发展,经济规模已经居于世界前列,为保持我国经济高质量可持续发展,国家适时提出通过刺激内需拉动经济增长,中央提出了构建国内国际双循环的新经济发展格局.在这一经济结构转型过程中,消费金融在促进消费、扩大内需方面具有积极的推动作用.从2010年开始,监管部门就开始消费金融公司试点工作,到现在已取得了丰硕成果,有力地推动了居民消费.但消费金融公司在我国的发展还不是很成熟,存在着一些问题.本文总结了消费金融市场发展中的经验教训,分析了消费金融公司的优势及问题,提出了一些想法和建议,期望对我国消费金融市场起到有益帮助.     

Modeling electric taxis' charging behavior using real-world data

Charging behavior is critical to the development and deployment of electric vehicle (EV) systems, given its impacts in EV adoption, the energy and environmental performance of EVs, potential load change to the electric grid, etc. However, the general characteristics of practical charging behavior have not been well studied. Existing studies are mostly based on travel data from conventional internal combustion engine vehicles, modeled with assumed and simplified charging scenarios. The use of public charging infrastructure is often neglected. Few studies evaluate real-world charging behaviors of EVs currently in operation using public charging stations. To address this gap, this study analyzes the data of 39,372 charging events from 129 unique electric taxis in Shenzhen, China to study the distributions of daily charging frequency, charging start time, and charging duration. The insights we learned from this study are: 1) the daily frequency for a vehicle to visit charging stations is unlikely to exceed five times; 2) the distribution of charging start time have multiple peaks and can be fitted with Gaussian Mixture Models; 3) charging duration is influenced by charging start time; and 4) charging dynamics can be modeled using the distributions of daily charging frequency, charging start time, and charging duration. Results from this study can inform charging behavior modeling for EVs and charging infrastructure development.     

Interpreting Linear Beta Coefficients Alongside Feature Importances in Machine Learning

Atlantic Economic Journal -     

ACCRUALS AND MOMENTUM

We view accruals as a natural candidate to link to momentum in the context of the overreaction explanation. Accruals can proxy for ambiguity about the implications of new information for a firm's value and can vary with the business cycle. Thus, higher accruals can lead to greater behavioral biases in the cross-sectional and time-series dimensions and, hence, stronger momentum. Our results show that momentum profitability is mostly concentrated in firms with high accruals. The previously documented cross-sectional characteristics of momentum and market states do not subsume the effect of accruals on momentum. We also find that most of the momentum returns among high-accrual firms are attributable to high discretionary accruals.     

营商环境与民营企业创新 ——基于行政审批中心设立的准自然实验

优化营商环境是深化"放管服"改革的重要体现,对促进民营企业创新具有重要意义.文章以地级市设立行政审批中心为准自然实验,选取A股民营上市公司微观数据为样本,采用双重差分模型考察营商环境优化对民营企业创新的影响.研究结果表明:营商环境优化对民营企业创新具有显著的正向影响;营商环境优化对民营企业创新的影响具有明显的异质性,营商环境优化对无政治关联、行业竞争程度较低、融资约束程度较高企业的创新影响更大;从作用机制看,营商环境优化显著降低了民营企业的费用性制度交易成本和效率性制度交易成本,从而促进民营企业创新水平的提高.本研究对深入推进行政审批制度改革,优化民营企业营商环境,降低民营企业制度性交易成本,促进民营企业创新产出有一定的借鉴意义.     

资本市场国际影响力提升效应研究——来自A股纳入明晟(MSCI)新兴市场指数的证据

2018年5月15日,首批纳入明晟(MSCI)新兴市场指数的A股股票名单正式公布。我们发现,被纳入MSCI的股票(标的股票)在公告日前后有显著为正的累计超额收益。相较于主要特征相似的匹配股票,标的股票纳入MSCI后的分析师评级有显著提升。进一步研究表明,在公告日前后融资(融券)交易量显著上升(下降),而换手率没有明显变化,并且净融资交易与公告效应显著正相关。本文的发现表明,A股纳入MSCI这一事件具有明显的信息含量,传递了有关企业前景的正面信息,并促使本地市场聪明投资者进行更活跃的交易,这对促进价格发现、促成价值投资具有一定的推动作用。