基于主成分分析法的地铁运营关键绩效指标体系研究

目前国内研究尚缺乏一套科学的、系统的、有效的对地铁运营的评价体系.本文以成都地铁为研究对象,采用问卷调研法,将16个初级指标做成问卷让受访者进行打分,之后将数据导入SPSS软件,分析其效度与信度,剔除信度较低的指标,最终获得3个一级指标和15个重要的二级评价指标,并以此构建出一套对地铁运营绩效的评价指标.最后通过对受访者问卷的打分情况,分析出乘客看重哪些因子,并以此向相关部门提出建议.     

The impact of earnings pressure on exploratory innovation

While earnings expectation has been shown to determine a firm’s investment decisions, the knowledge about how such expectation influences a firm’s investment horizon for innovation is still blurred. This study therefore addresses this research issue by examining the relationship between earnings pressure and exploratory innovation while investigating the moderating effects of cross‐rival effect and resource availability. By examining high‐tech industrial firms in S&P 1500 from 2000 to 2012, the results indicate that stock analysts, as information intermediaries between innovation firms and the capital market, impose pressure through earnings forecasts on firms’ exploratory innovation. Our findings also reveal that the earnings pressure‐exploratory innovation relationship can be mitigated when its competitors encounter a higher level of earnings pressure. However, a firm’s financial slack shows less significant association to moderate the earnings pressure‐exploratory innovation relationship. Possible explanations for the results in regard to their theoretical and practical implications are discussed in this study.     

Are nontariff measures and tariffs substitutes? Some panel data evidence

Using new estimates of ad valorem equivalent of nontariff measures (NTMs) over time, this paper examines NTMs and tariffs’ relationship for a sample of 70 economies for 4,949 products at the 6‐digit harmonized system level over the period 2003–2015. A panel data methodology models the lagged adjustment of NTMs to tariffs, consistent with a causal relationship. Trade policy substitution is found when the models are estimated in both levels and changes; with this holding for both OECD and non‐OECD countries, but not for the agriculture sector in OECD countries. Overall, there is a fairly complete substitution between policy instruments in absolute terms.     

Personalized goal-based investing via multi-stage stochastic goal programming

In this paper, we propose a goal-based investment model that is suitable for personalized wealth management. The model only requires a few intuitive inputs such as size of wealth, investment amount, and consumption goals from individual investors. In particular, a priority level can be assigned to each consumption goal and the model provides a holistic solution based on a sequential approach starting with the highest priority. This allows strict prioritization by maximizing the probability of achieving higher priority goals that are not affected by goals with lower priorities. Furthermore, the proposed model is formulated as a linear program that efficiently finds the optimal financial plan. With its simplicity, flexibility, and computational efficiency, the proposed goal-based investment model provides a new framework for automated investment management services.     

基于角色视角的分享经济信任机制研究

基于信任理论，从不同角色视角探究各信任要素对分享经济行为意图的影响。通过构建分享经济信任机制概念模型以及实证检验发现：从需求方视角来看，对个体（供给方）3个维度（能力、正直和善意）的信任、对平台善意的信任以及对产品能力的信任对需求意图产生积极地影响。从供给方视角来看，对个体（需求方）能力的信任和对平台3个维度（能力、正直和善意）的信任对供给意图有正向的影响。需求方更关注人与人之间的信任，而供给方则更看重对平台的信任。通过进一步比较还发现，需求方对平台和个体（供给方）的信任聚焦于善意信任，但供给方则是侧重于对平台和个体（需求方）能力的信任。     

Institutional Monitoring: Evidence from the F‐Score

The extant literature shows that institutional investors engage in corporate governance to enhance a firm's long‐term value. Measuring firm performance using the F‐Score, we examine the persistent monitoring role of institutional investors and identify the financial aspects of a firm that institutional monitoring improves. We find strong evidence that long‐term institutions with large shareholdings consistently improve a firm's F‐Score and that such activity occurs primarily through the enhancement of the firm's operating efficiency. Other institutions reduce a firm's F‐Score. Moreover, we find evidence that, while monitoring institutions improve a firm's financial health, transient (followed by non‐transient) institutions trade on this information.     

Estimating the Competitive Storage Model with Trending Commodity Prices

We present a method to estimate jointly the parameters of a standard commodity storage model and the parameters characterizing the trend in commodity prices. This procedure allows the influence of a possible trend to be removed without restricting the model specification, and allows model and trend selection based on statistical criteria. The trend is modeled deterministically using linear or cubic spline functions of time. The results show that storage models with trend are always preferred to models without trend. They yield more plausible estimates of the structural parameters, with storage costs and demand elasticities that are more consistent with the literature. They imply occasional stockouts, whereas without trend the estimated models predict no stockouts over the sample period for most commodities. Moreover, accounting for a trend in the estimation implies price moments closer to those observed in commodity prices. Our results support the empirical relevance of the speculative storage model, and show that storage model estimations should not neglect the possibility of long‐run price trends. Copyright © 2016 John Wiley & Sons, Ltd.     

谷书堂关于社会主义商品经济理论的探索

文章认为,谷书堂是中国研究社会主义商品经济理论较早的学者之一,其研究社会主义商品经济理论分为20世纪50年代、70年代末至80年代初、90年代三个阶段。关于物质利益和劳动谋生手段是社会主义商品经济原因、社会主义商品经济是中性生产方式、商品经济与公有制双向调整论是谷书堂社会主义商品经济理论的基础。