Estimation of common location parameter of several heterogeneous exponential populations based on generalized order statistics

In this article, several independent populations following exponential distribution with common location parameter and unknown and unequal scale parameters are considered. From these populations, several independent samples of generalized order statistics (gos) are drawn. Under the setup of gos, the problem of estimation of common location parameter is discussed and various estimators of common location parameter are derived. The authors obtained maximum likelihood estimator (MLE), modified MLE and uniformly minimum variance unbiased estimator of common location parameter. Furthermore, under scaled-squared error loss function, a general inadmissibility result of invariant estimator is proposed. The derived results are further reduced for upper record values which is a special case of gos. Finally, simulation study and real life example are reported to show the performances of various competing estimators in terms of percentage risk improvement.     

新中国与阿曼关系的历史与现状

自新中国与阿曼建立外交关系以来,双方在政治、经济和文化等领域的友好合作关系是历史上数千年友好合作关系的延续。通过高层领导人和其他领域的互访,双方增进了各领域交流,在国际和地区事务中持一致或类似观点,珍惜彼此慷慨的援助以及在解决国际事务中的协调和支持。双方通过"中阿合作论坛"和中国与海合会战略对话等机制,在经济、贸易、文化、公共卫生及其他领域的互利合作拥有巨大潜力,使两国关系从传统友谊走向新兴合作伙伴。     

Influentials,novelty, and social contagion : The viral power of average friends,close communities,and old news

What is the effect of (1) popular individuals, and (2) community structures on the retransmission of socially contagious behavior? We examine a community of Twitter users over a five month period, operationalizing social contagion as ‘retweeting’, and social structure as the count of subgraphs (small patterns of ties and nodes) between users in the follower/following network.     

Evolutionary Process of Social Capital Formation through Community Currency Organizations: The Japanese Case

Community currency systems are said to influence the revival of communities by promoting either local economic growth or social capital accumulation. However, no empirical studies have examined the multiple competing mechanisms for providing social support through transactional networks among participants. The current study connects network structural concepts to theories of social capital, transaction costs, homophily, and resource dependency at multiple levels and evaluates transactional relationships for community rebuilding and local economic development. We examine the evolutionary process of dynamic networks among local residents or organization members with network configurations in one of the largest Japanese community currency systems, “Peanuts.” Using longitudinal network data over 12 years for approximately 1400 actors, we conclude that the evolution and achievement of transactional network dynamics and partner selections differ between the two groups of participants: individual members and organization members. We also provide practical implications for sustaining participants’ transactions and commitment.     

Cohort Differences and the Marriage Premium: Emergence of Gender‐Neutral Household Specialization Effects

Using fixed‐effects models and National Longitudinal Survey of Youth 1979 and National Longitudinal Survey of Youth 1997 data, we compared cohort, gender, and household specialization differences in the marriage premium. Do these premiums (a) persist among millennials, (b) reflect changing selection into marriage across cohorts, and (c) differ by the gender division of spousal work hours? Despite declining gender‐traditional household specialization, the millennial cohort garnered larger marriage premiums for women and men. Positive selection explained millenial women's marriage premiums, but less of men's. Household specialization mattered only among millennials, where it is gender neutral: Male and female breadwinners earned significantly larger marriage premiums, whereas husbands and wives specializing in nonmarket work earned no premium, or even penalties, when employed. Results show increasing disadvantage among breadwinner households, with dual earners most advantaged among millennials.     

Ribā-Based Mortgages in Dār al-Harb: An Issue of Modernist Application of Fiqh al-Aqalliyāt for Muslim Minorities

The growing presence of Muslims in the occident living as minorities in majority non-Muslim countries comes with inherent religious challenges. How can occidental Muslims live faithfully in cultures that cause perceivable “hardship” without compromising their religio-legal obligations? Is fiqh al-aqalliyāt the answer to this problem, if at all there is a problem? As a sample of the so-called “hardship”, this paper looks at the issue of occidental Muslims taking out ribā (interest or usury) based loans in order to buy a house, to test the theory of whether or not a new legal doctrine is required to facilitate Muslim needs facing exceptional circumstances. Is it a clash between classical and contemporary scholarship or an inevitable pre-modern evolution of Islamic jurisprudence? This article argues that juristic opinions, whether classical or contemporary do not justify any actions, because their opinions are first and foremost non-binding and secondly a result of their endeavor to come to an edict. The paper highlights a misapplication of juristic maxims and opinions, driven by zeal to provide an edict to justify the needs of some. It concludes that no added value is made to Islamic law by heterodox jurisprudence.     

How many people participated in candlelight protests? Counting the size of a dynamic crowd

The recent controversy about the size of crowds at candlelight protests in Korea raises an interesting question regarding the methods used to estimate crowd size. Protest organizers tend to count all participants in the event from its start to finish, while the police usually report the crowd size at its peak. While several counting methods are available to estimate the size of a crowd at a given time, counting the total number of the participants at a protest is not straightforward. In this paper, we propose a new estimator to count the total number of participants that we call the size of a dynamic crowd. We assume that the arrival and departure times of the crowd are randomly observed and that the number of the attendees in the crowd at a specific time is estimable. We estimate the number of total attendees during the entire gathering based on the capture-recapture model. We also propose a bootstrap procedure to construct a confidence interval for the crowd size. We demonstrate the performance of the proposed method with simulation studies and the data from Korea''s March for Science, a global event across the world on Earth Day, April 22, 2017.     

Analysis of state general sales tax policy: A complementary approach to the effects of causes and the causes of effects

Previous research and theory on state general sales tax policy provide the major factors and components of the sales tax base that affect revenue reliance and tax burden. However, previous research on general sales tax policy has concentrated on individual factors and components of the sales tax base without considering the interdependent and interrelated causes of revenue reliance and tax burden. In addition, regression-based analyses are limited in analyzing the causal conjunctures that affect revenue reliance and tax burden. Thus, this research focused on a complementary approach to the effects of causes and the causes of effects, thereby empirically examining the combined causes of revenue reliance and tax burden through a (fs) QCA analysis of U.S. state data spanning from 2007 to 2010. This study reveals that the combined causes of revenue reliance and tax burden vary as ideal types compared with the effects of real types observed in the panel data analysis. This study contributes to the current literature by examining interrelated and interdependent causal relationships with regard to revenue reliance and tax burden in a complementary manner. State governments must consider the combined effects of causal conjunctures that affect revenue reliance and tax burden.     

Discussion on “A comparison of Monte Carlo methods for computing marginal likelihoods of item response theory models”

In this discussion, the sensitivity of the result by the choice of parameters a and b in one of approaches reviewed by the authors to calculate the marginal likelihood for 2 parameter logistic item response theory model is investigated using a small simulation study.     

Nepalese Budgetary Dynamics: Following Incrementalism or Punctuated Equilibrium?

Public Organization Review - Government budget appropriation patterns are mainly explained by theories of incrementalism and punctuated equilibrium. Consistent with these theories, this study...