Adjusted Pearson Chi-Square feature screening for multi-classification with ultrahigh dimensional data

Huang et al. (J Bus Econ Stat 32:237–244, 2014) first proposed a Pearson Chi-Square based feature screening procedure tailored to multi-classification problem with ultrahigh dimensional categorical covariates, which is a common problem in practice but has seldom been discussed in the literature. However, their work establishes the sure screening property only in a limited setting. Moreover, the p value based adjustments when the number of categories involved by each covariate is different do not work well in several practical situations. In this paper, we propose an adjusted Pearson Chi-Square feature screening procedure and a modified method for tuning parameter selection. Theoretically, we establish the sure screening property of the proposed method in general settings. Empirically, the proposed method is more successful than Pearson Chi-Square feature screening in handling non-equal numbers of covariate categories in finite samples. Results of three simulation studies and one real data analysis are presented. Our work together with Huang et al. (J Bus Econ Stat 32:237–244, 2014) establishes a solid theoretical foundation and empirical evidence for the family of Pearson Chi-Square based feature screening methods.     

农村教育结构对中部地区农民收入结构的影响及对策研究

［目的］通过研究农村教育结构对中部地区农民收入结构的影响，为中部地区制定科学合理的农村教育发展政策提供建议。［方法］基于动态面板数据，利用Sys GMM法克服内生性问题进行实证分析。［结果］中部地区农村初等教育程度人力资本提高了农民农业收入占比，降低了农民非农业收入占比以及其他收入占比，不利于农民收入结构优化； 农村中等和高等教育程度人力资本均不利于农民农业收入占比提高，但有利于农民非农业收入占比以及其他收入占比提高，有利于农民收入结构优化，其中农村中等教育程度人力资本未显著提高农民其他收入占比，但与农村高等教育程度人力资本对中部地区农民收入结构的优化作用相比，中等教育程度人力资本的优化作用仍然较大； 分地区看，对于省会地区、地级市地区和县级市地区，中等教育程度人力资本和高等教育程度人力资本均有利于农民收入结构优化，其中省会地区高等教育程度人力资本对农民收入结构的优化作用最大，地级市地区和县级市地区中等教育程度人力资本的优化作用最大。［结论］中部地区为了优化农民收入结构，需进一步发展农村教育，提高农村人口中中等教育程度人力资本和高等教育程度人力资本占比，省会地区要侧重提高农村人口中高等教育程度人力资本占比，地级市地区和县级市地区而言，则需侧重提高农村人口中中等教育程度人力资本占比，但均需注意农村人口教育程度提高对农业收入的不利影响。     

Inbound openness and its impact on innovation performance: an agent-based and simulation approach

A firm’s superior innovation performance is embodied not only by its average innovation performance but also by the likelihood of extremely high innovative outcomes. The former benchmark is associated with the mean of the performance distribution, while the latter is associated with the variance, both of which play an important role in instructing the achievement of superior innovation performance. In this paper, we explored how inbound open innovation impacts superior innovation performance by considering both the average and variance effects of inbound openness. We conducted agent-based modeling and simulation research to untangle the relationship between inbound openness and superior innovation performance and how the relationship is moderated by the disruptiveness of industrial innovation. We found that inbound openness significantly influences both the benchmarks. Specifically, search breadth positively influences the likelihood of extremely high innovative outcomes in general, whereas search depth positively influences average innovation performance; and the strength of these effects varies under different disruptiveness.     

中部地区农村教育水平及其不同层次对农民收入差距的影响

[目的]通过研究中部地区农村教育水平及其不同层次对农民收入差距的影响,为中部地区制定科学合理的农村教育发展政策提供依据。[方法]利用Sys-GMM法实证研究。[结果]发现中部地区农村教育水平提高拉大了农民收入差距,其中农村初等教育水平提高有助于农民收入差距缩小,农村中等教育水平和高等教育水平提高拉大了农民收入差距,但随着农村这两类教育进一步发展,农民中低收入和低收入群体的收入结构将会优化,这两类教育将有可能缩小农民收入差距。分地区类型,相对地级市和县级市地区,中部省会地区农村教育水平对农民收入差距的拉大作用较大,3类地区农村初等教育水平提高均有助于农民收入差距缩小,3类地区农村中等教育水平和高等教育水平提高均拉大了农民收入差距,其中省会地区农村高等教育水平对农民收入差距的拉大作用更大,地级市和县级市地区农村中等教育水平对农民收入差距的拉大作用更大。[结论]为了尽快缩小农民收入差距,中部地区尤其是地级市和县级市地区需大力发展农村教育,特别是发展农村中等教育和高等教育,虽然短期内会扩大当地农民收入差距,但长期农村中等教育和高等教育发展会提高中低收入和低收入群体的非农业收入和财产性收入等其他收入,优化当地农民收入结构,进而缩小农民收入差距。     

我国耕地非农化研究进展及展望

［目的］通过梳理我国耕地非农化的研究进展，研判现有研究成效及不足，并结合新时代耕地非农化的诉求，厘定未来研究导向和重点，为增强耕地非农化成果精准性提供参考和借鉴。［方法］该文采用文献综述法和对比分析法总结我国耕地非农化的研究及发展趋势。［结果］（1）从研究内容上看，我国耕地非农化研究内容丰富，耕地非农化发展现状主要涉及耕地非农化时空演变特征及规律，发展异质性显著； 耕地非农化对经济发展的正面影响较为明显，但对社会及生态环境的负面影响更为突出； 驱动力及驱动机制对耕地非农化的作用具有两面性； 耕地非农化体制机制、技术层面的调控因地区性发展差异而有所不同； 研究多以耕地非农化的静态为主，动态性不强，对耕地非农化发展过程的控制与管控研究存在不足。（2）从研究尺度上看，我国耕地非农化研究集中在以全国和省市域为主的宏观地域上，对全国以及各省份及其内部范畴的耕地非农化做出研究分析，该尺度范围内耕地非农化发展大体呈不均衡态势，而目前我国对于微观层面上的研究相对较少。（3）从研究方法上看，学者们多以定性方法为主，采用定性与定量相结合的方法研究土地利用问题，通过数理统计分析研究耕地非农化的驱动机制，并结合遥感与GIS技术对土地利用变化进行动态监测，但多目标、多学科综合集成的智能体技术应用较少。［结论］创新耕地非农化的研究方法，构建智能决策模型； 加强耕地非农化过程管控研究，提高实时监控力度与吻合度； 厘清微观主体的行为特征，完善多尺度、多层次结构是今后研究的重点。     

Incentives for knowledge sharing: impact of organisational culture and information technology

This research presents and examines an analytical model of knowledge management in which organisational culture dynamically improves with knowledge-sharing and learning activities within organisations. We investigate the effects of organisational incentives and the level of information technology on the motivation of knowledge sharing. We derive a linear incentive reward structure for knowledge sharing under both homogeneous and heterogeneous conditions. In addition, we show how the organisational culture and the optimum linear sharing reward change with several crucial factors, and summarise three sets of methods (strong IT support, congruent organisational culture, and effective employee assessment) to complement the best linear incentive. Our research provides valuable insights for practitioners in terms of implementing knowledge-management initiatives.     

Assessing preferences for mega sports event travel products: a choice experimental approach

Hosting mega sports events spreads positive destination images and generates massive tourism arrivals for the host communities. It is, therefore, important for tourism businesses to better understand what types of travel products, tailored for particular mega sports events, are purchased by sport tourists. Using a choice experimental approach, this study aims to examine how sport tourists formulate their preferences for travel products customized for the 2018 PyeongChang Winter Olympic Games by making intricate trade-offs among various product attributes. We utilize a gender perspective to further understand the preference dynamics embedded in segmented sport tourism markets. Study results suggest that sport tourists put distinctive weights on each of the attributes comprising the Olympic travel products. Gender differences are also identified in sport tourists’ choice decisions for sports event travel products. Based on the study findings, this paper proposes several marketing strategies to meet the needs of targeted market segments.     

Saving golf courses from business troubles

Utilizing a discrete choice experiment, this study attempts to provide improved knowledge regarding how golf tourists arrive at complex trade-offs between different golfing constraints and resort to diverse negotiation strategies to attenuate the effect of those constraining factors. With a study sample of Korean golf tourists, we find that respondents place distinctive weights on several golf course attributes representing various types of golfing constraints to attain the greatest enjoyment. Among a range of barriers to golf trip participation, golf tourists place the highest importance on structural constraints associated with limited personal time resources and inadequate access to golf courses. The study results substantiate golf tourists’ heterogeneous preferences for negotiation strategies, which are dependent upon their levels of golf specialization. Multiple management suggestions are developed to help golf course professionals adapt to the gradually challenging business environment.     

四川省中国重要农业文化遗产旅游资源价值评价及开发探析

四川是一个农业大省,有8处中国重要农业文化遗产。为促进四川省中国重要农业文化遗产旅游的发展,实现对农业文化遗产的可持续性开发利用和保护,文章首先分析了四川省的中国重要农业文化遗产旅游发展概况以及困境,然后建立了农业文化遗产旅游资源价值评价体系,对8处农业文化遗产的旅游价值进行定量分析。分析结果表明:四川农业文化遗产旅游资源平均得分为7.89分,有5处遗产未达到平均分,但这5处遗产的得分距平均分差距并不大;大部分农业文化遗产的知名度和开发利用程度、相关产业的形成与发展没有与旅游产业形成良好的互动结合。基于分析结果,本文提出了四种促进四川省中国重要农业文化遗产旅游发展的模式,包括实景体验模式、遗产展馆模式、研学旅游模式和联合发展模式。     

基于创新流视角的广东省城市创新体系与职能

在知识经济时代,创新在社会经济发展的作用越来越显著。城市作为创新的重要载体,研究城市创新体系与城市创新职能结构对构建创新型国家具有重要意义。基于城市创新流视角,利用城市创新流强度,揭示了广东城市创新体系与创新职能结构。研究表明:广东形成一个以深圳、广州为塔顶的三级塔型城市创新体系。商贸业是广东创新职能强度最大的部门,其他依次为科教文卫业、金融与房地产业、交通与信息业、工业与建筑业、农林牧渔业、公共管理与服务业。除农林牧渔业外,珠江三角洲是各行业部门创新职能强度的高位区,但不同区域各职能表现不同。