A class of bivariate regression models for discrete and/or continuous responses

ABSTRACT

A general class of models for discrete and/or continuous responses is proposed in which joint distributions are constructed via the conditional approach. It is assumed that the distributions of one response and of the other response given the first one belong to exponential family of distributions. Furthermore, the marginal means are related to the covariates by link functions and a dependency structure between the responses is inserted into the model. Estimation methods, diagnostic analysis and a simulation study considering a Bernoulli-exponential model, a particular case of the class, are presented. Finally, this model is used in a real data set.     

Estimation of Survivorship Function Based on Doubly Censored Data with Application to HIV/AIDS

Left censoring concept has been defined in different ways in statistical applications. Turnbull (1974 Turnbull , B. W. ( 1974 ). Nonparametric estimation of a survivorship function with doubly censored data . J. Amer. Statist. Assoc. 69 : 169 – 173 .[Taylor & Francis Online], [Web of Science ®] , [Google Scholar]) defines it in a particular way. Whereas in recent literature, especially in epidemiological studies, it has been defined in another way. This difference between the two approaches is the main reason that despite simplicity, Turnbull method cannot be applicable in all cases of doubly censored data. In this article we present a modified Turnbull method for analysis of doubly censored data adequate with recent definition. Comparison has been done with other statistical methods, including imputation estimator, full likelihood-based and conditional likelihood-based approach using Iranian HIV data.     

A stepwise approach for the purely periodic interaction spline model

The basic idea of an interaction spline model was presented in Barry (1983). The general interaction spline models were proposed by Wahba (1986). The purely periodic spline model, a special case of the general interaction spline models, is considered in this paper. A stepwise approach using generalized cross validation (GCV) for fitting the model is proposed. Based on the nice orthogonality properties of the purely periodic functions, the stepwise approach is a promising method for the interaction spline model. The approach can also be generalized to the non-purely-periodic spline models. But this is no done here.     

A Bayesian Adjustment for Covariate Misclassification with Correlated Binary Outcome Data

Estimated associations between an outcome variable and misclassified covariates tend to be biased when the methods of estimation that ignore the classification error are applied. Available methods to account for misclassification often require the use of a validation sample (i.e. a gold standard). In practice, however, such a gold standard may be unavailable or impractical. We propose a Bayesian approach to adjust for misclassification in a binary covariate in the random effect logistic model when a gold standard is not available. This Markov Chain Monte Carlo (MCMC) approach uses two imperfect measures of a dichotomous exposure under the assumptions of conditional independence and non-differential misclassification. A simulated numerical example and a real clinical example are given to illustrate the proposed approach. Our results suggest that the estimated log odds of inpatient care and the corresponding standard deviation are much larger in our proposed method compared with the models ignoring misclassification. Ignoring misclassification produces downwardly biased estimates and underestimate uncertainty.     

汉字的表音化取向

长期以来大家都普遍认为汉字属表意体系的方块文字,汉字不是音素文字,但汉字表音的方式仍是十分明显的。它用特殊的形式来表现读音,这就是汉字里占80%以上的形声字。汉字这种形声化的取向从甲骨文开始就表现得极为清晰,经金文、篆文、隶书到今天的简化汉字,汉字表音的取向已经发展成为汉字发展的主流。     

英语语法教学的趋同性与灵活性

语法教学的策略既应具有被实践证明了的普遍原则性,即趋同性,又应具有具体问题具体分析的灵活性。文章围绕英语教学中语法教学的趋同性和灵活性进行了简要证述。     

紧贴行业的应用型人才培养模式之研究

广东白云学院在推进汽车检测与维修技术专业教学改革过程中,紧紧围绕汽车服务业的现状和特点,以行业人才需求为依据,确定专业培养目标和人才规格,以行业的岗位能力要求为出发点,构建高效、实用的培养方案,以服务于行业为目标,建立有行业参与的教学机制,在人才培养质量上取得了优异的成绩。     

我国中小企业社会责任法律规制的路径选择刍议

企业社会责任是企业在衡平企业利益和社会利益、谋求和谐发展的基础上,负有的旨在维护和促进公共秩序、安全和公共利益的义务。鉴于中小企业自身的特殊性,对我国中小企业社会责任的法律规制,应当充分考虑其经营、发展特点,以此为逻辑起点来寻求中小企业利益与社会利益的合理衡平。法律规制的重点在于立法约束层面,在路径选择上应注重其基本法律义务的履行。     

土工布充泥袋技术在软土地区修筑路堤中的应用探讨

研究土工布充泥袋技术的工程特性、施工过程、测试结果,在讨论充泥袋预应变加筋机理的基础上,说明土工布充泥袋常规设计要点,具有一定的推广应用价值.     

探索有效途径 提高《法律基础》课教学效果

法律基础课是对青年学生进行马克思主义法学理论和法律常识教育的主渠道、主阵地。积极探索提高法律基础课教学效果的有效途径 ,是从事这项教学工作的教师必须认真思考和解决的问题。应从提高教师自身素质入手 ,紧密联系实际 ,注重培养学生的能力 ,切实提高法律基础课的教学效果。