Testing equality of two normal covariance matrices with monotone missing data

Abstract

The problem of testing equality of two multivariate normal covariance matrices is considered. Assuming that the incomplete data are of monotone pattern, a quantity similar to the Likelihood Ratio Test Statistic is proposed. A satisfactory approximation to the distribution of the quantity is derived. Hypothesis testing based on the approximate distribution is outlined. The merits of the test are investigated using Monte Carlo simulation. Monte Carlo studies indicate that the test is very satisfactory even for moderately small samples. The proposed methods are illustrated using an example.     

Toward a sociology of global comparative placemaking

I call for a globally informed sociology of comparative placemaking that integrates historical and contemporary processes and includes the ephemeral, institutional, and personal. By placemaking, I am referring to the explicit or tacit cooperation among people to create, maintain, and give meaning to places in space through bodily occupation given differential resources and constraints. I review select place, space, and community-based literature about urban, Black, migrant, LGBTQ, and international populations to think about how we can build upon and integrate multiple theoretical, methodological, and epistemological insights to form an explicit placemaking research agenda. A US focus on neighborhoods contrasts with a comparative examination of global urban networks, social polarization, and transformation of the built environment in the interdisciplinary field of global urban studies (Ren, 2018). I argue for a placemaking research agenda that bridges insight from US Urban Sociology with Global Urban Studies to consider how various structures and actors constrain and facilitate place projects. With a globally reaching and comparatively informed sociology of placemaking, we can illuminate our multi-structured story of place and agency in context. We can answer questions about how and why we co-create and are simultaneously disciplined by the process of creation.     

我国民事审级制度的改革与完善——比较法学视角下的分析

比较分析中国、日本、德国、美国、法国及我国台湾地区的民事审级制度可以看出我国审级制度中存在的弊端。实际上 ,实行有条件的三审终审制更具合理性。为此 ,我国原有的两审终审制必须加以改革 ,那就是实行以两审终审为原则、以三审终审为例外的民事审级制度。     

黑龙江（汉族）民歌衍变过程探析——对黑龙江、河北（汉族）民歌的比较

黑龙江汉族民歌的衍变历经了数百年的岁月沧桑，它与民族迁徙、人口变迁以及文化传统等存在着极为密切的联系。通过对黑龙江民歌与河北、山东、河南、山西民歌进行比较，表明黑龙江民歌与河北民歌之间存在着较近的亲缘关系。因此，文章试图在对较有代表性的几首黑龙江与河北民歌比较研究的基础上进一步探究黑龙江民歌衍变的影响因素。     

Statistical and Combinatorial Aspects of Comparative Genomics*

Abstract. This document presents a survey of the statistical and combinatorial aspects of four areas of comparative genomics: gene order based measures of evolutionary distances between species, construction of phylogenetic trees, detection of horizontal transfer of genes, and detection of ancient whole genome duplications.     

中日菜名音节构造模式差异之比较研究

中式菜肴的命名在音节方面具有一些特征,并有一定的规律可循,日式菜肴的命名同样如此。中日菜名在音节构造模式上有各自的特点和规律。     

比较文学:历史探求与现实思考

比较文学自诞生以来经历了三次危机。对于中西比较文学来说,危机既是挑战也是机遇。就目前中国比较文学的研究现状而言,要紧的还是脚踏实地,多做研究。要对国际学术界共同关心的问题形成自己的独到见解,提出并解决已有的理论话语未曾涉及的理论命题,真正做到理论创新,从而争取国际文化对话中的话语权。     

我国花生生产的比较优势分析

作为重要的油料和经济作物 ,同时还是我国重要的出口创汇农产品 ,花生在我国农业生产中占有重要的地位。低廉的劳动力成本和较高的单产水平造就了我国花生较强的比较优势 ,但品质及专用性等问题却制约了其比较优势向市场竞争力的转化。文章从分析我国花生生产的比较优势出发 ,探讨了将我国花生生产的比较优势转化为市场竞争力的有效途径。     

儒、释、道的养生观比较研究

作为我国传统文化的儒学,佛教和道教,均有其各自的养生观。认真总结儒、释、道三家养生文化,取其精华,去其糟粕,不但具有学术理论意义,而且对构筑小康社会,预防疾病、增强人民身心健康、提高生活质量也具有现实借鉴意义。