Pairwise- and marginal-likelihood estimation for the mixed Rasch model with binary data

A marginal–pairwise-likelihood estimation approach is examined in the mixed Rasch model with the binary response and logit link. This method belonging to the broad class of composite likelihood provides estimators with desirable asymptotic properties such as consistency and asymptotic normality. We study the performance of the proposed methodology when the random effect distribution is misspecified. A simulation study was conducted to compare this approach with the maximum marginal likelihood. The different results are also illustrated with an analysis of the real data set from a quality-of-life study.     

编译英国《Cassell英语常用词组用法词典》感言 ——奈达的翻译指导原则和里奇的“意义之四层次”一瞥

在编译此英国Cassell词典时,时而会碰到一些难以理解或难以翻译的成语,不得不求助于多种技艺,以使问题获得切实解决,为此,文中引用了不少实例,以阐明尤金.奈达的翻译指导原则和杰弗里.里奇的＂意义之四层次＂的真谛。     

考虑徐变影响的双面组合连续箱梁应力分析

研究钢 混凝土双面组合连续箱梁的徐变问题。根据混凝土徐变后的双面组合连续箱梁的截面应力自相平衡,内力仍为零这一条件,通过平衡方程得到负弯矩区截面的曲率,进而得到截面的应力计算公式;通过算例分析双面组合连续箱梁的应力重分布情况。     

市场经济视域中的道德层次分析

在人们生活方式日益多样化,价值观念日趋多元化的今天,道德也具有多重性,按照方向划分,既包含符合伦理要求的正向道德,又包括逆伦理要求的负向道德;按照经济文化影响划分,包括自然道德和社会道德。市场经济道德是基于底线伦理之上的道德层次。只有互利和信任才是市场经济的道德基础。     

油画综合材料拓展下的艺术探索

绘画材料作为艺术载体在艺术创作过程中扮演着重要角色,材料的发展贯穿于传统艺术与现代艺术之中。本文基于对油画材料从传统的坦培拉材料技术到现代的油画材料拓展的过程,分析新材料在一定时间和空间中,对创作不同语言风格的艺术作品的影响,从而挖掘综合材料与绘画发展的内在关系。     

Optimal Composite Markers for Time‐Dependent Receiver Operating Characteristic Curves with Censored Survival Data

Abstract. To increase the predictive abilities of several plasma biomarkers on the coronary artery disease (CAD)‐related vital statuses over time, our research interest mainly focuses on seeking combinations of these biomarkers with the highest time‐dependent receiver operating characteristic curves. An extended generalized linear model (EGLM) with time‐varying coefficients and an unknown bivariate link function is used to characterize the conditional distribution of time to CAD‐related death. Based on censored survival data, two non‐parametric procedures are proposed to estimate the optimal composite markers, linear predictors in the EGLM model. Estimation methods for the classification accuracies of the optimal composite markers are also proposed. In the article we establish theoretical results of the estimators and examine the corresponding finite‐sample properties through a series of simulations with different sample sizes, censoring rates and censoring mechanisms. Our optimization procedures and estimators are further shown to be useful through an application to a prospective cohort study of patients undergoing angiography.     

互联网环境下的企业商业模式概念和定位研究

为了理解商业模式与已有企业理论和概念的关系,完善对商业模式的认识,首先从研究商业模式与企业战略的关系出发,确定了商业模式在企业中的定位;然后通过与数据库设计层次的类比分析,更加明晰了企业规划与运作层次以及商业模式的概念与作用.     

Variable selection and weighted composite quantile estimation of regression parameters with left-truncated data

In this paper, we consider the weighted composite quantile regression for linear model with left-truncated data. The adaptive penalized procedure for variable selection is proposed. The asymptotic normality and oracle property of the resulting estimators are also established. Simulation studies are conducted to illustrate the finite sample performance of the proposed methods.     

Childhood Sexual Abuse Severity Reconsidered: A Factor Structure of CSA Characteristics

To address the lack of empirically grounded measures of childhood sexual abuse severity, a survey of self-report items was developed following a thorough review of the childhood sexual abuse literature. An exploratory factor analysis was conducted using data collected from a convenience sample of college students that included 275 females and males with a history of childhood sexual abuse. The solution produced seven factors interpreted as the following: (a) less intrusive forms of childhood sexual abuse (e.g., sexual invitations, kissing), (b) more intrusive forms of childhood sexual abuse (e.g., oral sex, intercourse), (c) humiliation/fear, (d) childhood sexual abuse involving photography, (e) familiarity with the perpetrator, (f) physical force/rape, and (g) active digital penetration. Correlations among these factors further suggested the existence of two relatively independent second-order factors, one based on the levels of physical intrusiveness and the other composed of the psychological/emotional factors. While arguably the most common measurement of severity, physical intrusiveness had little association with critical factors such as humiliation, fear, and association with the perpetrator. Consequently, physical intrusiveness appears to be an inadequate stand-alone measure of childhood sexual abuse severity. These results are proposed to lay the groundwork for an improved, more comprehensive measure of childhood sexual abuse severity.     

The Structure of Pregnancy Intervals by Planning Status

Measures of pregnancy intervals are reported for data from the 1975 National Fertility Study in the United States. The structure of such intervals is aggregated into its components by planning status. A measurement model is devised to infer from a survival function some dimensions of the initial distribution of respondents by propensity to experience the event in question. It is adaptable to the study of reproductive intention as well as fecundability and contraceptive effectiveness. The model is applied to the study of the dependence of such behaviour in a given interval on the planning status of the previous pregnancy. Planning status is sequentially well-ordered. Those previously successful with contraceptive use are less likely to fail than those who had previously failed; those who had previously used contraception, whether successful or not, are less likely to fail than those who had not previously used. The credibility of the findings is prejudiced less by the form of model than by the reliability of the basic data.