Design selection for strong orthogonal arrays

Strong orthogonal arrays (SOAs) were recently introduced and studied as a class of space‐filling designs for computer experiments. An important problem that has not been addressed in the literature is that of design selection for such arrays. In this article, we conduct a systematic investigation into this problem, and we focus on the most useful SOA(n,m,4,2 + )s and SOA(n,m,4,2)s. This article first addresses the problem of design selection for SOAs of strength 2+ by examining their three‐dimensional projections. Both theoretical and computational results are presented. When SOAs of strength 2+ do not exist, we formulate a general framework for the selection of SOAs of strength 2 by looking at their two‐dimensional projections. The approach is fruitful, as it is applicable when SOAs of strength 2+ do not exist and it gives rise to them when they do. The Canadian Journal of Statistics 47: 302–314; 2019 © 2019 Statistical Society of Canada     

转型时期中央与地方的博弈——一个共同代理的观点

在中国经济的转型时期,地方政府是同时代表中央和地方利益的共同代理人.本文运用共同代理模型分析了三方之间的博弈,并着重从激励的角度讨论了中央是否应该限制地方利益集团对地方政府的影响.我们的模型表明,当中央与地方的利益互补时,地方政府与地方之间的交易能减少中央对地方政府的激励成本,因而中央应该选择容忍；而当中央与地方的利益相互竞争时,该结论也有可能成立.最后,我们用这一结果解释了地方政府助推房价上涨的原因.     

`Sex-Equal' Stable Matchings

The paper defines a measure on the set of stable matchings in the marriage problem. This measure is based on the minimization of the envy difference between the sets of men and women, while preserving stability and selects stable matchings with the least conflict of interest between both groups of agents. The solution concept proposed is called Sex-equal Matching (SEM) and the paper also provides an algorithm to compute the set of SEM.     

论加快土地流转制度改革

随着生产力水平的不断提高,在生产社会化、分工专业化的新形式下,家庭联产承包责任制面临着新的问题,因此,加快土地流转制度改革,是我国农业现代化发展的必由之路。作者首先指出家庭联产承包责任制面临的四个问题;然后分析各种土地流转方式的特点,认为必须从实际出发,因地制宜,不搞一刀切;最后强调做好这项改革所必须做好的四项配套工作,如加快培育土地转让市场、转移农村剩余劳动力等。     

Psychological mechanisms of investors in Chinese Stock Markets

The study investigated the psychological mechanisms of risky investment behaviors in Chinese Stock Markets. A 42-item questionnaire was developed and distributed to 1547 individual investors recruited by stratified random sampling from Nan Fang Bond Company. A speculative orientation and a low level of risk perception among Chinese investors were revealed. The results also showed that investors were deficient in investment knowledge and skills. Structural equation modeling was used to generate a risk perception-mediated model for investment behaviors. We found that information from organizational/institutional level can precipitate low risk perception and policy-oriented speculation of investors, which could be accounted for by the collectivistic culture in China and may not be beneficial to risk management in Chinese Stock Markets. Suggestions were made regarding the further development of stock markets in China.     

“镜湖诗”中的陆游晚年农村市场生活

在晚年的贫困面前,陆游大胆地突破了封建士大夫思想的束缚,积极投身到当时江南地区方兴未艾的农村市场市镇发展热潮中并使自己家庭的生活得以改善。在陆游的“镜湖诗”中有不少篇什以自叙的方式记录了陆游本人和他的家庭在农村市场经济发展大潮中的生存状态和应对措施,本文意在通过对这部分诗歌的分析,全方位地了解诗人晚年围绕农村市场的活动轨迹,进而获取极为宝贵的了解南宋时期江南农村社会经济发展及其对农民生活生产和思想观念所产生影响的第一手材料。     

On a Class of Distributions Defined by the Relationship Between Their Density and Distribution Functions

Knowledge concerning the family of univariate continuous distributions with density function f and distribution function F defined through the relation f(x) = F ^α(x)(1 ? F(x))^β, α, β ? , is reviewed and modestly extended. Symmetry, modality, tail behavior, order statistics, shape properties based on the mode, L-moments, and—for the first time—transformations between members of the family are the general properties considered. Fully tractable special cases include all the complementary beta distributions (including uniform, power law and cosine distributions), the logistic, exponential and Pareto distributions, the Student t distribution on 2 degrees of freedom and, newly, the distribution corresponding to α = β = 5/2. The logistic distribution is central to some of the developments of the article.     

Reflections on grounding firm innovation and viability

Entrepreneurial activity unfolds in a dynamic environment that challenges business viability. We utilize grounded theory as a novel type of reflection to explain and interpret whether and how innovation can afford survival benefits to firms. The premise is the application of a methodological approach with reflexive properties to advance scientific rigor in “reflections.” The idea underlying our reflection was to use innovation as the point of departure, review the literature, conceptualize ideas, and finally link the concepts that emerged as components of a framework. Our view of the firm resembles a viable entity that changes, constantly striving to meet and balance internal potentials and external complexities, while innovation per se involves change that is made possible by entrepreneurship. We bring together our personal and professional backgrounds and implement the European scholarly tradition on innovation and Viable Systems approach to scrutinize innovation’s interactions and relations. We linked boundary conditions, opportunities, and complementary assets to innovation. Effectively, our analysis conceptualizes innovation as autopoiesis in entrepreneurship and demonstrates its central role as the vehicle to exploit changes that ensure firm viability.     

Complementary health approaches for postpartum depression: A systematic review

Postpartum Depression (PPD) affects approximately 9 - 20% of women. Many women with PPD go undiagnosed and/ or do not follow through on referrals for treatment. Although the most routinely prescribed treatments for PPD are antidepressant medication and psychotherapy, a significant number of women desire non-traditional options. This article provides a systematic review of ten recently published, randomized clinical trials in the examination of the effectiveness of complementary health approaches—the use of non-mainstream products and interventions—on PPD. A search of nine databases of the English language literature from the years 2006 to 2018 was performed. Review criteria included published work, utilization of randomized-controlled trials, and the use of a reliable and valid measurement tool to identify cases of PPD and monitor changes in symptom severity. The studies reviewed focused on the following interventions: aromatherapy, bright light therapy, electroacupuncture, infant massage, iron supplementation, mindfulness training, omega-3 fatty acids, saffron, and yoga. Outcomes demonstrate the feasibility and safety of these approaches, as well as varying degrees of effectiveness. While many were pilot studies using small sample sizes, the results are encouraging and substantiate the need for additional trials. Studies are summarized and limitations and implications for social work and future research are described.     

Seeking Closure: Competition in Complementary Markets*

When offering a product that has a complementary product in a different market, a firm must consider the interdependence between the complementary products as well as the competition within markets. If the firm participates in both markets, the balancing act becomes even more challenging. This article provides insights about strategies in this latter setting: when should the firm seek to keep its products closed to competing complementary products, and when would the firm be better off by accepting a common standard? To address these questions, we employ standard game theoretic analysis to a simple spatial model that captures aspects of both intermarket externalities and intramarket competition. We find that if a firm participates in both markets and chooses a closed standard, it achieves lower profits compared to an open standard, but gains greater market share. Surprisingly, we find that customers are better off when standards are kept closed.