The exponential distribution analog of the Grubbs–Weaver method

Abstract

Grubbs and Weaver (1947 Grubbs, F. E., and C. L. Weaver. 1947. The best unbiased estimate of population standard deviation based on group ranges. Journal of the American Statistical Association 42 (238):224–41. doi: 10.2307/2280652.[Taylor & Francis Online], [Web of Science ®] , [Google Scholar]) suggest a minimum-variance unbiased estimator for the population standard deviation of a normal random variable, where a random sample is drawn and a weighted sum of the ranges of subsamples is calculated. The optimal choice involves using as many subsamples of size eight as possible. They verified their results numerically for samples of size up to 100, and conjectured that their “rule of eights” is valid for all sample sizes. Here we examine the analogous problem where the underlying distribution is exponential and find that a “rule of fours” yields optimality and prove the result rigorously.     

Some Reflections on the Legacies of Michael White: An Australian Perspective

This article, which appears in a special 30‐year anniversary edition of the Australian and New Zealand Journal of Family Therapy, reflects on the legacies of the work of Michael White. It begins by looking back on Michael's time as editor of the Australian Journal of Family Therapy. Of the many themes that were discussed in the Editorials and Letters to the Editor section of this journal in the early 1980s, this article focuses on three in particular to explore the legacies of the work of Michael White. The author describes how Michael has bequeathed not only a profound body of work, but also a distinctive spirit of originating, and ways of working that consider the effects of social issues and that examine the politics of experience. It is the author's hope that this approach to considering Michael White's legacies honours his work and also honours the contributions of the Australian and New Zealand Journal of Family Therapy in its 30th year.     

额什丁家族史论

考察 14世纪以后的苏非派 ,不应忽视额什丁家族的重要作用。这一家族并不是中亚显赫的家族 ,但在特定时期登上了历史的舞台 ,并且其家族首领扮演了较为特别的角色。同时 ,他们和上层统治者有着千丝万缕的联系。这似乎是一种历史的偶然性或者是巧合 ,但仔细探究当时的历史背景 ,不难看出宗教和政治自身需要的内在互动以及或明或暗的结合 ,完成了家族的双重“使命” ,也为一个王朝的灭亡埋下了伏笔     

关于汉族、达斡尔族家庭教养方式的跨文化比较研究

本研究采取的是同一地区不同民族跨文化比较研究,目的是通过汉族和达斡尔族学生家长的取样测试,揭示汉族、达斡尔族家庭教养方式的民族差异,探讨有关影响因素,为合理、有效的家庭教育提供科学依据。     

Orientation relationship in finite dimensional space

In the present article, we discuss the regression of a point on the surface of a unit sphere in d dimensions given a point on the surface of a unit sphere in p dimensions, where p may not be equal to d. Point projection is added to the rotation and linear transformation for regression link function. The identifiability of the model is proved. Then, parameter estimation in this set up is discussed. Simulation studies and data analyses are done to illustrate the model.     

基于E-NSBM模型的中国省际资源环境效率动态评价

从资源环境系统的内部结构出发,将资源环境评价体系分为生产系统和环境治理系统,针对该结构建立了扩展强自由处置性下的网络DEA模型——E-NSBM模型,将其与窗口分析法相结合,对2005-2012年中国各省资源环境效率进行了评价。结果表明：我国经济发达地区的生产系统效率普遍较高而环境治理系统效率较低;中、西部地区环境治理系统效率较高,但东部地区环境治理系统效率改进幅度最大;综合效率表现差的省份普遍表现为高的能耗强度、碳排放强度和硫强度。因此,各省应根据各自发展需要来确定资源环境效率的改进途径。     

年轻夫妇“两头走”——乡村家庭权力结构变迁的新现象

近年来,年轻夫妇“两头走”这一新型家庭居住模式逐渐在鄂西农村变得普遍起来。通过实地调查着重分析了这种物理空间意义上的居住模式重塑的微观家庭权力结构,进而探讨家庭成员间的权利义务关系的变迁。不同于传统从父居模式下的以男方父代家庭与年轻夫妇为主、女方父代家庭较为次要的主次型家庭权力结构,两头走的婚居模式形塑的家庭权力结构为男女双方父代家庭与年轻夫妇的三角平等结构。这对我们认识当下的代际关系与养老、年轻人的独立等问题有着现实意义。     

中日两国人名、称谓文化考

姓名是个人与社会联系的纽带,是个人在社会上存在的一种证明。称谓是以本人为轴心确定亲属以及非亲属与本人关系的标志。无论是在中国还是在日本,姓名和称谓对于人们来说都有着非常重要的意义。但是,由于两国的历史文化以及价值取向不同,导致了两国人民在对姓名及称谓的认知不尽相同。中国古代在名字的使用上有避讳的制度。在言谈和书写时,遇到君父长上的名字一律要回避。取名时也不能取他们的名字中有的或同音的字。这一习俗在亲属称谓以及社会称谓习俗上也留有烙印。从文化对比的角度,以人名的避讳为切入口,分析中日两国的姓名及称谓的特征和差异以及所产生的原因。这一研究有助于我们对中日两国的姓名及称谓有一个更加系统的认识,对中日两国的社会、传统文化有更加深入的了解。     

民族旅游地民居客栈经营的关键因素研究--以世界遗产地丽江古城为例

旅游体验满意是衡量旅游者忠诚与重顾的关键因素。旅游者对以世界文化遗产地丽江古城的民居客栈体验的网络评价,主要涉及了“家”、整洁、舒适、环境、房间陈设、位置等六个方面,这些都是影响民居客栈成功经营的关键因素。但是就旅游者体验来说,这些因素明显缺乏了地方文化的展现与创新。基于此,文章从酒店化与专业化、家庭化与生活化、文化化与乡野化的视域上重新设计了民居客栈经营发展的创新模式,凸显出民居客栈产品与酒店产品的差异性,创建一种独具地方特色的民居品牌,助推民居经营的永续发展。