Logistic discrimination using robust estimators: An influence function approach

Logistic regression is frequently used for classifying observations into two groups. Unfortunately there are often outlying observations in a data set and these might affect the estimated model and the associated classification error rate. In this paper, the authors study the effect of observations in the training sample on the error rate by deriving influence functions. They obtain a general expression for the influence function of the error rate, and they compute it for the maximum likelihood estimator as well as for several robust logistic discrimination procedures. Besides being of interest in their own right, the influence functions are also used to derive asymptotic classification efficiencies of different logistic discrimination rules. The authors also show how influential points can be detected by means of a diagnostic plot based on the values of the influence function     

基于界壳论的电信企业竞争力研究

本文基于界壳理论构建了电信企业多重竞争力界壳模型,通过对该模型的定量分析,能够确定电信企业竞争力界壳的开放度和交换率,企业就可以据此制定出具有较强针对性的竞争力发展策略,提高电信企业决策的科学性。     

论我国个人所得税制的建设与改革

完善个人所得税制是构建我国双主体税制的重要内容之一,也是长期以来税制改革的着力点。1980年全国人大通过《个人所得税法》,之后陆续进行五次修改,为我国立法史所罕见。个人所得税税制模式转型、税率水平与结构的调整、所得扣除的改革、纳税申报制度的完善、立法程序的民主化等始终是个人所得税制改革的重点。     

A Note on Nonparametric Regression with β-Mixing Sequences

Statistical risks of least-squares estimates of a regression function (possibly nonlinear) are studied under a β-mixing setup. The assumptions are minimal and are virtually the same as those of the i.i.d. case. The bounds obtained are optimal, up to a term of order log n. Similar results are also obtained for complexity regularized regression estimates in the presence of penalty functions.     

The Development of an Instrument to Measure the Psychological Response to Separation and Divorce

In recent years there has been an increase in the number of individuals seeking help from mental health professionals with issues related to separation and divorce. In order to understand the psychological impact of divorce on individuals the theory of mourning developed by John Bowlby has been used by many clinicians to inform their practice. Using data collected from 123 separated or divorced adults an instrument designed to measure Bowlby's three phases of mourning is developed. Implications for clinical practice and research are discussed.     

Marital Separation/Divorce

A review of the literature was conducted to determine the current knowledge base regarding the impact of marital separation or divorce on the individual. The review focused on the literature in psychiatry, psychology, and social work, but also included related disciplines, such as family law. The findings indicate a focusing of research questions since the early 1970's, particularly in defining the process of divorce and differential impact of the various stages across gender. However, some gaps still exist within the literature, pointing toward additional research questions, such as in the area of treatment, and the impact of initiator status.     

An Evaluation of Divorce Support Groups

Abstract

The purpose of this study was to evaluate support groups among divorced people. Eleven females and seven males participated in three groups. The participants were interviewed, and some themes were considered. Among these were what it had meant for the subjects to participate in a group, what were the most important functions of the group, and if the participants had benefited psychologically from participating in the group. Four therapeutic factors seemed to be of particular importance. First, meeting people with the same thoughts and feelings, and increased insight of themselves and others. Further, feeling accepted and supported, and expressing difficult feelings were important factors. Group participation increased the subjects' well-being, for example, they felt more normal and less depressed.     

Adjustment to Stepfatherhood:

Marital history and characteristics of stepchildren were viewed as factors ,which influence adjustment to step- fatherhood. It was hypothesized that marital history affected the amount of conflict present in the relationship between the stepfather and his stepchildren. Characteristics of the stepchildren were viewed as factors which allowed stepfathers to successfully handle potential conflict. Using a sample of stepfathers who were married in 1980- 1983 in Orange County, California, it was found that marital history was somewhat related to the stepfathers' involvement with theu stepchildren in some activities. Marital history was also somewhat related to the stepfather's feelings about and reactions to his step- children. However, the key to the stepfather's adjustment was whether his biological children were present in the household. The effects of this variable were found to be positive. It was concluded that the relationship between marital history and stepfather adjust- ment is complex and varying.     

积分中值定理“中间点”收敛速度的一个估计

利用函数连续模分别给出了第一积分中值定理和第二积分中值定理的“中间点”收敛速度的一个估计。     

Repartnering: the relevance of parenthood and gender to cohabitation and remarriage among the formerly married

This paper is an exploratory analysis of the impact of current and anticipated parenthood on cohabitation and remarriage among those formerly living in marriage-type relationships. The focus on children is embedded within a broader analysis of repartnering which takes account of other factors, including gender. Quantitative and qualitative analyses are used, with a multivariate analysis of repartnering patterns, using data from the General Household Survey, being complemented by in-depth interview data examining the attitudes of the formerly married to future relationships. The paper demonstrates that parenthood has a statistically significant effect on the likelihood of formerly married women repartnering, with a higher number of children being associated with a lower probability of repartnering. The presence of children can work against repartnering in a variety of ways. Children place demands on their parents and can deter or object to potential partners. Parents may see their parental role as more important than, and a barrier to, new relationships. However, mothers are typically looking for partners for themselves rather than fathers for their children. Among formerly married people without children, the desire to become a parent encourages repartnering. The paper concludes that parenthood should be a key consideration in analyses of repartnering.