Construction of incomplete Sudoku square and partially balanced incomplete block designs

Abstract

The present article deals with the study of association among the elements of a Sudoku square. In this direction, we have defined an association scheme and constructed incomplete Sudoku square designs which are capable of studying four explanatory variables and also happen to be the designs for two-way elimination of heterogeneity. Some series of Partially Balanced Incomplete Block (PBIB) designs have also been obtained.     

异质、冲击与对策：互联网金融与银行业的共生发展--基于博弈视角的分析

互联网金融的崛起,既通过"增量式"改革模式推动我国金融体系的完善和再造,又以"搅局者"异质效应冲击当前金融市场主体,特别是银行业的传统优势。目前,我国互联网金融发展模式相对单一,与银行业相比具有异质性。基于博弈论的视角,有必要加强对互联网金融的监管,充分发挥互联网金融和传统银行业的比较优势,错位竞争,形成互利共生的良性循环。采取多种措施促进互联网金融和传统银行业健康可持续的共生发展。     

可行能力与农民工的福利状况评价

基于辽宁省沈阳市农民工调查数据,应用森的可行能力理论和模糊数学方法对农民工的福利状况进行整体评价。结果发现,农民工福利水平的总模糊指数为0.365,处于较低水平。分指标看,健康状况方面的福利状况处于较高水平,居住环境和精神感受方面的福利状况处于中间水平,其它功能性指标的福利水平较低。在影响农民工福利的主要因素中,工作环境和防护性保障的改善对提升农民工福利影响最大。运用OLS回归模型对农民工的福利状况进行扩展分析,发现农民工群体内部存在较强的异质性,并且不同特征的农民工群体福利水平相差很大。     

中西文论异质性比较研究——新批评在中国的命运

新批评是现代英语学界文学研究中影响最大的一个理论流派,持续时间也最长.但是新批评对中国文论界的影响始终不大.英美新批评与作为中国现代主流文论的马克思主义文论,在意识形态上存在着难以逾越的鸿沟,在艺术理论上也有着鲜明的异质性.中国古代文论带有强烈的印象式批评特点,而新批评则带有强烈的形式主义和科学主义倾向,尽管新批评与中国古代文艺思想之间也有着某种程度上的相通之处,但是两者之间这些强烈和根本的异质性,决定了新批评在中国始终处于边缘化的境遇.     

重庆市县域商品房价格时空变化特征研究——基于空间统计分析法

以2005—2015年重庆市38个区（县）商品房价格数据为样本，利用空间自相关等空间统计分析方法对重庆市县域商品房价格的空间分布和时空演变特征进行研究。研究结果表明：渝东北地区商品房价格稳定性相对最好，渝西地区次之，渝东南地区再次之，主城区商品房价格稳定性最差；重庆市商品房价格具有较强的空间集聚性，但随着时间的推移，空间集聚性逐渐减弱，商品房价格空间差异逐渐缩小；重庆市商品房价格区域差异呈现明显的空间二元结构，房地产发展热点区域主要集中于主城九区，远郊区县的房地产发展相对缓慢。     

Copula-based regression models: A survey

In this review paper we collect several results about copula-based models, especially concerning regression models, by focusing on some insurance applications.     

Structural holes and managerial performance: Identifying the underlying mechanisms

Structural holes theory suggests a variety of possible explanations for the empirically observed relationship between structural holes and individual managerial performance. However, little has been done to disentangle one mechanism from another. This paper empirically tests a mediated moderation model that distinguishes between the five different theoretical mechanisms: autonomy, competition, information brokering, opportunity recognition and innovativeness. The findings suggest that of these five theoretical causal motors, innovativeness plays a key role in linking network structure and network content to performance.     

Semiparametric Analysis of Network Formation

ABSTRACT

We consider a statistical model for directed network formation that features both node-specific parameters that capture degree heterogeneity and common parameters that reflect homophily among nodes. The goal is to perform statistical inference on the homophily parameters while treating the node-specific parameters as fixed effects. Jointly estimating all parameters leads to incidental-parameter bias and incorrect inference. As an alternative, we develop an approach based on a sufficient statistic that separates inference on the homophily parameters from estimation of the fixed effects. The estimator is easy to compute and can be applied to both dense and sparse networks, and is shown to have desirable asymptotic properties under sequences of growing networks. We illustrate the improvements of this estimator over maximum likelihood and bias-corrected estimation in a series of numerical experiments. The technique is applied to explain the import and export patterns in a dense network of countries and to estimate a more sparse advice network among attorneys in a corporate law firm.     

‘Show me the money and the party!’ – variation in Facebook and Twitter adoption by politicians

Our study explores the adoption of Facebook and Twitter by candidates in the 2013 German Federal elections. Utilizing data from the German Longitudinal Election Study candidate survey fused with data gathered on the Twitter and Facebook use of candidates, we draw a clear distinction between Facebook and Twitter. We show that adoption of both channels is primarily driven by two factors: party and money. But the impact of each plays out differently for Facebook and Twitter. While the influence of money is homogenous for Facebook and Twitter with the more resources candidates have, the more likely they are to adopt, the effect is stronger for Facebook. Conversely, a party’s impact on adoption is heterogeneous across channels, a pattern we suggest is driven by the different audiences Facebook and Twitter attract. We also find candidates’ personality traits only correlate with Twitter adoption, but their impact is minimal. Our findings demonstrate that social media adoption by politicians is far from homogenous, and that there is a need to differentiate social media channels from one another when exploring motivations for their use.     

Multistate life‐tables and regression models

A survey is given of the use of modern statistical techniques in event history analysis, and in particular in the study of multi‐state life‐tables in demography. Emphasis is placed on the interplay between partial likelihood and nonparametric maximum likelihood based methods, a) when analysing semi‐Markov models or models with repeated spells, and b) in frailty models for inobservable heterogeneity.